Roadbed in-situ dust control mixing device and dust control method thereof

Abstract

The roadbed in-situ dust control mixing device comprises a rainproof and dustproof device, a paving and stirring device and a track operation device, the rainproof and dustproof device comprises a unit framework, a top face telescopic frame, a stand column telescopic frame, dustproof cloth and rainproof cloth, and the dustproof cloth and the rainproof cloth are arranged through the top face telescopic frame and the stand column telescopic frame; the dustproof cloth and the rainproof cloth are regulated and controlled to cover a construction area, construction dust and rainwater are prevented from invading, and the dust mixing effect is kept; the paving and stirring device comprises a driving wheel and a stirring drum, and the driving wheel drives the stirring drum to run along the track so as to uniformly mix the soft soil and the curing agent; the track operation device is used for smooth movement of the driving wheels at all positions of the construction site. According to the roadbed in-situ dust control mixing device, three technical means of water mist dust control, rotary suction dust removal and shielding dust isolation are comprehensively applied, effective control over construction flying dust is achieved, the dust falling effect is improved, pollution to the environment is reduced, and the health of constructors is protected.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering construction, and in particular relates to a roadbed in-situ dust control mixing device and a dust control method thereof. Background Art

[0002] With the acceleration of urbanization and the continuous expansion of transportation infrastructure, coastal highway construction has become an important support for regional economic development. However, when constructing highways in coastal areas, soft soil with high water content is often encountered. Soft soil has the characteristics of high compressibility, low strength and easy deformation, which poses a serious threat to the stability and durability of highways. In order to improve the engineering properties of soft soil, the traditional practice is to increase the bearing capacity of the soil and reduce its compressibility by adding stabilizers such as lime.

[0003] However, the method of treating soft soil with lime has many challenges and limitations in practical application, including high construction difficulty and high requirements for construction site conditions. First, lime treatment requires lime to be evenly mixed into soft soil, but the high water content and low strength of soft soil make this process complicated and difficult. Especially in soft soil with high water content, soil blocks are difficult to crush and uneven lime mixing can easily lead to lime failure. This not only increases the complexity of construction, but may also affect the final treatment effect. The lime mixing process requires a large amount of space to stack and mix materials, which is particularly prominent in coastal areas with tight land resources. Secondly, although lime mixing can effectively improve the strength and stability of soft soil, this method involves the use of chemical materials, which may have adverse effects on the surrounding environment. A large amount of dust will be generated during the lime mixing process, which not only poses a threat to the health of construction workers, but may also pollute the surrounding environment and affect air quality and ecological balance. In addition, the rainy climate conditions in coastal areas also have an adverse effect on the effect of lime addition. Rainfall will reduce the effective content of lime in the soil, increase the water content of the soil, and cause changes in soil structure, such as soil expansion and crack development. These changes may affect the uniform mixing and penetration of lime, thereby weakening the improvement effect of lime addition and even leading to a decline in project quality.

[0004] In rainy weather, construction workers usually stop outdoor lime mixing construction or prepare rain protection measures such as canopies in advance. However, the existing rain protection measures are complex to build, have a small coverage area, slow response speed, low turnover rate, and do not solve the dust problem. Therefore, there is an urgent need for a portable lime mixing construction equipment that can prevent rain and dust and has a large construction range to minimize the adverse effects of rainy days on outdoor lime mixing construction and the impact of construction dust on the surrounding environment. Summary of the invention

[0005] The first object of the present invention is to provide a roadbed in-situ dust control mixing device in view of the problems in the prior art.

[0006] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0007] A roadbed in-situ dust control mixing device, characterized in that it comprises a rainproof and dustproof device, a paving and mixing device, and a track running device, wherein the rainproof and dustproof device comprises a unit frame, a top telescopic frame, a column telescopic frame, and a dustproof cloth and a rainproof cloth, and the dustproof cloth and the rainproof cloth are regulated to cover the construction area through the top telescopic frame and the column telescopic frame, and the dustproof cloth and the rainproof cloth are regulated to cover the construction area, so as to block the diffusion of dust, prevent rainwater from invading the lime mixing area, and maintain the lime mixing effect;

[0008] The paving and mixing device includes a driving wheel and a mixing drum. The driving wheel drives the mixing drum along a track running device to evenly mix the soft soil and the curing agent. The mixing drum includes a mixing drum shell, a knife arrangement mechanism, a powder spray nozzle, a liquid curing agent spray nozzle and a high-pressure atomizing spray nozzle. The driving wheel is started to drive the mixing drum to rotate to achieve stirring and mixing of the materials. While the mixing drum rotates, the powder spray nozzle or the liquid curing agent spray nozzle starts to spray outward to make the mixing more uniform. The high-pressure atomizing spray nozzle produces fine vapor droplets to absorb the powder in the air.

[0009] The unit frame is provided with an air supply column, which is equipped with a fan, and the air outlet is connected to the dust collector. The fan and the dust collector are turned on at the same time to create a swirl flow, so that the dust is sucked to the center of the swirl flow, and the dust that has not been processed by the high-pressure atomization nozzle is carried to the dust collector to complete the dust removal;

[0010] The track running device allows the drive wheels to move smoothly around the construction site.

[0011] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions: As the preferred technical solution of the present invention: the rain and dustproof device comprises a unit frame, a top telescopic frame, a column telescopic frame, a dustproof cloth and a rainproof cloth, the unit frame comprises a unit truss and a unit column, and a slide groove is provided in the middle of the unit truss and the column to reduce the dead weight and facilitate the connection between the units;

[0012] The unit truss is directly welded to the column, and a track pulley is connected to the bottom of the column for easy movement. The sizes of the unit truss and the column can be selected according to the size of the construction site; the top telescopic frame and the column telescopic frame are designed to be adjustable, and each unit truss is connected by the top telescopic frame, and each unit column is connected by the column telescopic frame to achieve the retractability of the rain and dustproof device.

[0013] As a preferred technical solution of the present invention: the mixing drum shell is made of high-quality carbon steel and is coated with a polyethylene material coating to improve the wear resistance and corrosion resistance of the mixing drum shell;

[0014] The blade arrangement mechanism is provided with a T-shaped blade to increase the contact area between the soft soil and the curing agent during the mixing process. The blade is made of 316 stainless steel and a polyethylene coating is provided on the surface to prevent the blade from being corroded by corrosive substances in the soil. The powder spray head and the liquid curing agent spray head are both umbrella-shaped spray heads made of 316 stainless steel. The powder spray head and the liquid curing agent spray head are respectively connected to the powder clinker pipe and the liquid curing agent feed pipe to mix the material with the stirring drum while mixing. The umbrella-shaped spray head sprays the powder or liquid curing agent in a mist-like and uniform manner to improve the uniformity of mixing.

[0015] The high-pressure atomizing nozzle is a tungsten carbide atomizing nozzle with a nozzle aperture of less than 1mm. When the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through a pipeline through a high-pressure water pump, and then sprayed out through the high-pressure atomizing nozzle. On the one hand, the high-pressure atomizing nozzle assists in blowing the curing agent into the soft soil to mix the curing agent and the soil evenly, and on the other hand, it cleans the clay adhering to the blade to avoid the soil adhesion phenomenon in soft soil construction; at the same time, the high-pressure liquid generates fine vapor droplets through the high-pressure atomizing nozzle. These fine droplets can diffuse rapidly after entering the working space, absorb heat from the air to complete vaporization, and suspend in the air for a long time. They can absorb dust in the air and turn it into large particles for sedimentation, which has the dust removal effect of adsorbing dust and reducing the amount of dust.

[0016] As a preferred technical solution of the present invention: a plurality of T-blades are spirally arranged on the outer shell of the mixing drum, and the plurality of blades are all arranged obliquely to improve mixing efficiency and uniformity; an electric motor drives the mixing drum to rotate axially to achieve uniform mixing of the soil, and the height and width of the mixing drum can be adjusted according to the soil properties and the construction area; the spreading mixing device can turn over and mix the lime-mixed soil along a set track.

[0017] As a preferred technical solution of the present invention: the track operating device includes a guide rail, a track pulley and a driving trolley. The track pulley is used in conjunction with the guide rail and connected to the bottom of the unit column. The driving trolley is the power core of the device and is driven by a motor to achieve rapid extension and retraction of the device. The driving trolley is connected to the outermost unit skeleton and contacts the guide rail to provide good load distribution and running stability.

[0018] As a preferred technical solution of the present invention: an adjustable braking system is installed on the driving trolley to achieve rapid stopping or starting of the driving trolley.

[0019] The second object of the present invention is to provide a dust control method for a roadbed in-situ dust control mixing device in response to the problems in the prior art.

[0020] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0021] A dust control method for a roadbed in-situ dust control mixing device, characterized in that: the dust control method includes primary water mist dust control, secondary rotary suction dust removal and tertiary shielding dust isolation;

[0022] First-level water mist dust control: when the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through the pipeline by the high-pressure water pump, and then the high-pressure atomizing nozzle generates fine vapor droplets. These fine droplets can diffuse rapidly after entering the working space, absorb heat from the air to complete vaporization, and stay suspended in the air for a long time, which can absorb the dust in the air and turn it into large particles for precipitation, thus absorbing dust, reducing the amount of dust and realizing dust removal;

[0023] Secondary rotary suction dust removal: When the device is working, the dust collector is connected to the exhaust port and the air is drawn out to provide axial airflow for the equipment. At the same time, when the four sides are closed, the four air supply columns are used to create an exhaust flow field in a clockwise direction to provide shear airflow, and the air cohesion is used to drive the surrounding airflow to move tangentially to form a swirl. The swirl has a strong gathering function, which can efficiently suck the dust to the center of the swirl, and then carry the dust to the dust collector to complete the dust removal.

[0024] After the first and second level dust control, the remaining trace dust can be blocked by the third level dust shielding, and dustproof cloth and rainproof cloth can be used to prevent the dust from spreading outward.

[0025] Compared with the prior art, the in-situ dust control mixing device and dust control method of the roadbed of the present invention have the following beneficial effects: the first-level water mist dust control is realized by using the high-pressure water pump equipped with the mixing, the dust collector and the exhaust port are connected in combination, the swirl formed by the axial airflow flow is used to efficiently suck the dust to the swirl center, and carry it to the dust collector to complete the dust removal, so as to achieve the second-level rotary suction dust removal, and the remaining trace dust is blocked by the third-level shielding dust isolation, so as to prevent the dust from spreading outward to the maximum extent, and protect the construction environment and the health of the construction personnel. The in-situ dust control mixing device of the roadbed realizes the effective control of the construction dust by comprehensively using the three technical means of water mist dust control, rotary suction dust removal and shielding dust isolation, which not only improves the dust reduction effect, but also reduces the pollution to the environment and protects the health of the construction personnel; the device is designed to be rainproof and dustproof, has a large working range and can be constructed in situ, does not require a large amount of space to stack and mix materials, and greatly improves the convenience of construction. The ash mixing process can be carried out inside the device, which effectively avoids the influence of external environmental factors, especially rainy days, on the ash mixing effect. In addition, the device also integrates the mixing function, eliminating the need for additional mixing equipment, further improving construction efficiency and project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front structural schematic diagram of a roadbed in-situ dust control mixing device of the present invention;

[0027] Figure 2It is a side structural schematic diagram of a roadbed in-situ dust control mixing device of the present invention;

[0028] Figure 3 It is a schematic diagram of the top view of the structure of a roadbed in-situ dust control mixing device of the present invention;

[0029] Figure 4 This is a schematic diagram of the principle of rotary suction dust control technology;

[0030] Figure 5 It is a schematic diagram of the stirring drum structure;

[0031] In the attached drawings, 1a~1e are unit skeletons; 2 are unit trusses; 3 are unit columns; 4 are top telescopic frames; 5 are column telescopic frames; 6 are slideways; 7 are rainproof cloths; 8 are dustproof cloths; 9 are driving wheels; 10 are mixing drums; 11 are guide rails for rainproof and dustproof devices; 12 are guide rails for paving and mixing devices; 13 are track pulleys; 14 are driving trolleys; 15 are air supply columns; 16 are air exhaust ports; 17 are mixing drum casings; 18 are knife row mechanisms; 19 are powder spray nozzles; 20 are liquid curing agent spray nozzles; 21 are high-pressure atomizing spray nozzles. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] The dust control method of the roadbed in-situ dust control mixing device of the present invention is based on a roadbed in-situ dust control mixing device, which is designed to be rainproof and dustproof, has a large working range and can be constructed in situ, without requiring a large amount of space to stack and mix materials, greatly improving the convenience of construction. The ash mixing process can be carried out inside the device, effectively avoiding the influence of external environmental factors, especially rainy days, on the ash mixing effect. In addition, the device also integrates a mixing function, without the need for additional mixing equipment, further improving construction efficiency and project quality.

[0034] The dust control method of the roadbed in-situ dust control mixing device of the present invention is achieved through the following technical scheme: a roadbed in-situ dust control mixing device and a use method thereof, comprising a rainproof and dustproof device, a paving and mixing device, and a track running device.

[0035] The rainproof and dustproof device consists of a unit frame, a top telescopic frame, a column telescopic frame, a dustproof cloth and a rainproof cloth.

[0036] The unit skeleton is composed of a unit truss and a unit column. The unit truss is made of high-strength aluminum alloy material, which not only ensures the stability of the structure, but also reduces the overall weight and is easy to transport and install. The unit column is made of Q355 steel, and the surface is galvanized for rust prevention. The bottom of the column is connected to a track pulley for easy movement. The unit truss and the middle of the column are provided with a slide groove to reduce the dead weight and facilitate the connection between units. The unit truss is directly welded to the column, and the size of the unit truss and the column can be selected according to the size of the construction site.

[0037] The top telescopic frame is designed to be adjustable and is made of lightweight alloy. Each unit truss is connected by the top telescopic frame, and the coverage range can be adjusted according to the specific needs of the construction site. It is combined with the unit truss and the rainproof cloth to form a large-area protective canopy.

[0038] The column telescopic frame is made of Q355 steel, and the surface is galvanized for rust prevention. It not only has excellent mechanical properties, but also is corrosion-resistant, ensuring the reliability of long-term outdoor use. Each unit column is connected to each other through the column telescopic frame, and the coverage area can be flexibly adjusted according to the changes in the construction scope. It is combined with the unit column and dustproof cloth to effectively reduce the impact of ash-mixed dust on the surrounding environment of the construction.

[0039] The dustproof cloth and rainproof cloth are important components of the device. They are both made of high-density polyethylene material. The surface of the rainproof cloth is treated with PVC coating and has excellent waterproof performance. The surface of the dustproof cloth is coated with a layer of dustproof agent, which has excellent dustproof performance. The dustproof cloth is responsible for blocking dust and protecting the construction environment from pollution; the rainproof cloth effectively prevents rainwater from invading the ash-mixing area and maintains the ash-mixing effect of the soil.

[0040] The design of the rain and dust proof device takes into account the rainy and windy climate characteristics of coastal areas. The retractable design not only improves the adaptability and flexibility of the device, but also greatly improves the construction efficiency and project quality.

[0041] The paving and mixing device is composed of a driving wheel and a mixing drum. The driving wheel is sturdy and durable, and is made of cast polyurethane. The driving wheel drives the mixing drum to move horizontally along the track, ensuring that the paving and mixing effect of the mixing drum is fully covered in the equipment environment. The mixing drum is a key component of the device. A plurality of blades are spirally arranged on the outer shell of the mixing drum, and the plurality of blades are tilted to help improve the mixing efficiency and uniformity. The electric motor drives the mixing drum to rotate axially to achieve uniform mixing of the soil. The height and width of the mixing drum can be adjusted according to the soil properties and the construction area to meet the needs of different projects.

[0042] The track running device is composed of a guide rail, a track pulley and a driving trolley. The guide rail is made of high-strength aluminum alloy, which not only has excellent wear resistance, but also corrosion resistance, ensuring stability in long-term use. The design of the guide rail fully considers the load-bearing capacity and running stability, ensuring the smooth movement of the driving trolley on the track. The track pulley is made of cast polyurethane and alloy steel, and is used in conjunction with the guide rail to connect the bottom of the unit column. The driving trolley is the power core of the device, driven by a motor, and can achieve rapid extension and retraction of the device. The driving trolley is connected to the outermost unit frame, and a plurality of running wheels are installed at the bottom of the driving trolley, which is in contact with the guide rail, providing good load distribution and running stability. In order to further improve the working efficiency and adaptability of the device, the driving trolley is also equipped with an adjustable braking system, which can stop or start quickly and accurately as needed, ensuring precise control of the device.

[0043] Furthermore, the design of the rain and dust prevention device takes into account the rainy and windy climate characteristics of the coastal area. The lime mixing process can be carried out inside the device, effectively avoiding the influence of external environmental factors. It can block dust and protect the construction environment from pollution. It can also effectively prevent rainwater from invading the lime mixing area and maintain the lime mixing effect of the soil.

[0044] Furthermore, the rain and dust proof device not only improves the adaptability and flexibility of the device through a retractable design, but also greatly improves the construction efficiency and project quality.

[0045] Furthermore, the paving and mixing device can stir the lime-mixed soil along a set track without the need for additional stirring equipment, further improving construction efficiency and project quality.

[0046] The roadbed in-situ dust control mixing device and dust control method of the present invention have the following beneficial effects:

[0047] It can solve the problem of dust in outdoor ash mixing construction on rainy days, where the existing rain protection measures are complex to build, have a small coverage area, slow response speed, low turnover rate, and fail to solve the problem.

[0048] This patent is designed to be rainproof and dustproof. The ash mixing process can be carried out inside the device, effectively avoiding the influence of external environmental factors, especially the rainy days on the ash mixing effect, and can effectively reduce the pollution of dust to the environment. This patent has a large working range, is portable and can be constructed in situ, without a large amount of space to stack and mix materials, greatly improving the efficiency and convenience of construction.

[0049] In the present invention, a stirring function is also integrated, and no additional stirring equipment is required, thereby further improving construction efficiency and project quality.

[0050] In view of the soft soil or soil solidification characteristics, mainly focusing on the problem of uniform mixing and the mixing head easily sticking to the soft soil, the mixing equipment is introduced in detail:

[0051] A single mixing drum is composed of a mixing drum shell, a knife arrangement mechanism, a powder spray nozzle, a liquid curing agent spray nozzle and a high-pressure atomizing spray nozzle.

[0052] The mixing drum shell is made of high-quality carbon steel and is coated with polyethylene material to improve the wear resistance and corrosion resistance of the mixing drum shell.

[0053] The knife arrangement mechanism is equipped with a "T"-shaped blade to increase the contact area between the soft soil and the curing agent during the mixing process, allowing the curing agent and the soft soil to collide and mix multiple times, thereby improving the uniformity of mixing. The material is 316 stainless steel, and a polyethylene coating is provided on the surface to prevent the corrosive substances in the soil from corroding the blades and increase the service life of the knife arrangement mechanism.

[0054] Both the powder nozzle and the liquid curing agent nozzle are umbrella-shaped nozzles made of 316 stainless steel. The powder nozzle and the liquid curing agent nozzle are connected to the powder clinker pipe and the liquid curing agent feed pipe respectively. The powder or liquid curing agent can be mixed with ash and sprayed at the same time as the stirring drum is mixed. The umbrella-shaped nozzle sprays the powder or liquid curing agent in a mist evenly, which can improve the uniformity of mixing.

[0055] The high-pressure atomizing nozzle is a special tungsten carbide atomizing nozzle with good corrosion resistance, oxidation resistance and aging resistance. The aperture of the nozzle is less than 1mm. When the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through the pipeline by the high-pressure water pump, and then sprayed out through the high-pressure atomizing nozzle. On the one hand, the high-pressure atomizing nozzle can assist in blowing the curing agent into the soft soil to mix the curing agent and the soil evenly. On the other hand, it can clean the clay adhering to the blade to avoid the soil adhesion phenomenon in soft soil construction. At the same time, the high-pressure liquid generates fine vapor droplets through the high-pressure atomizing nozzle. These fine droplets can diffuse rapidly after entering the working space, absorb heat from the air to complete vaporization, and suspend in the air for a long time. It can absorb dust in the air and turn it into large particles for sedimentation, which has the dust removal effect of adsorbing dust and reducing the amount of dust.

[0056] The dust control method of the roadbed in-situ dust control mixing device of the present invention realizes dust control through the following steps: the dust control technology of the roadbed in-situ dust control mixing device consists of three parts, namely, primary water mist dust control, secondary rotary suction dust removal and tertiary shielding dust isolation.

[0057] The first level of dust control is water mist dust control. When the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through the pipeline by the high-pressure water pump, and then the high-pressure atomizing nozzle produces fine vapor droplets. These fine droplets can quickly diffuse after entering the working space, absorb heat from the air to complete vaporization, and stay suspended in the air for a long time. They can absorb dust in the air and turn it into large particles for precipitation, which has the effect of absorbing dust and reducing the amount of dust. The second level of dust control is rotary suction dust removal, such as Figure 4 As shown, when the equipment is working, the dust collector is connected to the exhaust port and air is exhausted outward to provide axial airflow for the equipment. At the same time, when the four sides are closed, the exhaust flow field is created in a clockwise direction through four air supply columns to provide shear airflow, and the air cohesion is used to drive the surrounding airflow to move tangentially to form a vortex. The vortex has a strong gathering function, which can efficiently suck the dust to the center of the vortex, and then carry the dust to the dust collector to complete the dust removal.

[0058] After the first and second level dust control, the remaining trace dust can be blocked by the third level dust shielding to minimize the spread of dust.

[0059] The working principle of a roadbed in-situ dust control mixing device and its use method is modified as follows:

[0060] When using this equipment for lime-soil construction, a detailed construction plan needs to be drawn up, involving the proportion of roadbed lime, material selection and other aspects, and the scope of the construction area is established. The construction site should be equipped with longitudinal and transverse slopes and a complete drainage system, and the excavation depth should be adjusted according to actual needs. Before construction, drainage ditches should be set up around to lower the groundwater level. In order to ensure smooth transportation after rain, the access road should be kept flat and compacted by rolling to meet the traffic capacity and load requirements during construction, and regular maintenance should be carried out during construction. After the preparation work is completed, the rainproof and dustproof lime-soil construction device can be placed on the construction site, and the rainproof and dustproof device guide rail 11 and the paving and mixing device guide rail 12 are positioned and laid. After the track pulley 13 at the bottom of the unit frame is fitted with the rainproof and dustproof device guide rail 11, the driving trolley 14 is started to drive the unit frame 1e to move. The extension direction of the rainproof and dustproof device should follow the drainage direction of the site. The length is preferably 30 to 50 meters, which is determined according to the geometric dimensions of the construction site. Subsequently, the driving wheel 9 and the stirring drum 10 are assembled, and then the driving wheel 9 is fitted with the guide rail 12 of the paving and stirring device. The mixing earthwork volume and the amount of powder or liquid curing agent are calculated according to the extension range of the rain and dustproof device, and the required powder or liquid curing agent is prepared, stored in the corresponding barrel and connected to the powder nozzle 19 and the liquid curing agent nozzle 20 through the powder delivery pipe and the liquid curing agent delivery pipe. After setting the pressure of the nozzle pressure pump according to the demand, start the driving wheel 9 and the stirring drum 10 to start stirring. While the stirring drum rotates, the powder nozzle 19 or the liquid curing agent nozzle 20 starts to spray outward, which can make the mixing more uniform. At the same time, the dust control system also starts to operate, the nozzle pressure pump is set to at least 2MPa and the high-pressure liquid is transported to the high-pressure atomizing nozzle 21 through a pipeline, and then the high-pressure atomizing nozzle 21 produces fine vapor droplets, which absorb the dust in the air into large particles and settle, and can reduce the soft soil adhesion phenomenon on the cutter mechanism 18. Connect the air supply column 15 to the fan, connect the air outlet 16 to the dust collector, turn on the fan and the dust collector at the same time to create a swirl, suck the dust to the center of the swirl, and then carry the dust that has not been processed by the high-pressure atomizing nozzle 21 to the dust collector to complete the dust removal. During construction, the rotation speed of the stirring drum is stabilized between 25 and 40 r / min, and the driving wheel 9 controls the stirring drum 10 to move in the device, and the moving speed is controlled between 0.8 and 1.2 m / min. First, spray and mix according to 60% to 70% of the designed dosage. After the stirring drum 10 runs back and forth in the device, stop for 3 to 5 minutes to allow the powder or liquid curing agent to fully react with the soil, and then spray and mix the remaining powder or liquid curing agent for a second time. At this time, the mixing is basically uniform. The second mixing can break up the large agglomerated soil particles, so that the powder or liquid curing agent enters the large agglomerated soil particles, making the mixing skeleton uniform. The entire construction process is carried out inside the device, effectively avoiding the influence of external environmental factors and reducing the pollution of the environment caused by construction.After the construction is completed, the driving trolley 14 can be controlled to drive the unit frame 1e to move in the opposite direction, shrink the device to a portable size and evacuate the site to facilitate subsequent leveling and rolling construction by a bulldozer.

[0061] Example 1

[0062] like Figure 1-Figure 5 As shown, a roadbed in-situ dust control mixing device and a dust control method thereof of the present invention are based on a roadbed in-situ dust control mixing device of the present invention, and the device includes a rain and dust prevention device, a paving and mixing device, and a track running device. Figure 1 , 2 As shown in , 3, it includes unit skeletons 1a~1e, unit trusses 2, unit columns 3, top telescopic frames 4, column telescopic frames 5, slides 6, rainproof cloth 7, dustproof cloth 8, driving wheels 9, mixing drums 10, rainproof and dustproof device guide rails 11, paving and mixing device guide rails 12, track pulleys 13 and driving trolleys 14.

[0063] like Figure 1 , Figure 2 and Figure 3As shown, the rain and dustproof device consists of a unit frame 1, a top telescopic frame 4, a column telescopic frame 5, a dustproof cloth 8 and a rainproof cloth 7. The unit frame 1 consists of a unit truss 2 and a unit column 3. The unit truss 2 is made of high-rigidity aluminum alloy material, which ensures structural stability and reduces the overall load, and is conducive to transportation and assembly. The unit column 3 is made of Q355 steel and is electro-galvanized for corrosion protection. The bottom is connected to a track pulley 13 for easy movement. The unit truss 2 and the unit column 3 are respectively provided with a slide groove 6 in the middle, which helps to reduce their own weight and realize convenient connection between units. The unit truss 2 is directly connected to the unit column 3 by welding. The dustproof cloth 8 and the rainproof cloth 7 are both made of high-density polyethylene material. The rainproof cloth 7 is treated with PVC coating and has excellent waterproof performance; the dustproof cloth 8 is coated on the surface layer with a dustproof agent to ensure excellent dustproof effect. The paving and mixing device consists of a driving wheel 9 and a mixing drum 10. The driving wheel 9 is tough and durable, and is made of cast polyurethane. The driving wheel 9 carries the stirring drum 10 to move smoothly along the track to ensure that the stirring drum 10 is fully stirred in the equipment. The stirring drum 10 is the core component of the device. A plurality of blades are spirally arranged on its outer shell, and the blades are arranged at an angle, which helps to improve the stirring efficiency and uniformity. The electric motor drives the stirring drum 10 to rotate axially to achieve uniform stirring of the soil. The track operation device consists of a rainproof and dustproof device guide rail 11, a paving and stirring device guide rail 12, a track pulley 13 and a driving trolley 14. The rainproof and dustproof device guide rail 11 and the paving and stirring device guide rail 12 are both made of high-strength aluminum alloy, which not only has excellent wear resistance, but also corrosion resistance, ensuring stability for long-term use. The track pulley 13 is made of cast polyurethane and alloy steel, and is used in conjunction with the guide rail to connect the bottom of the unit column 3. The driving trolley 14 is the power core of the device, driven by a motor, and can achieve rapid expansion and contraction of the device. The driving trolley 14 is connected to the outermost unit frame 1e. The bottom of the driving trolley 14 is equipped with multiple running wheels, which are in contact with the guide rails, providing good load distribution and running stability. In order to further improve the working efficiency and adaptability of the device, the driving trolley 14 is also equipped with an adjustable braking system, which can stop or start quickly and accurately as needed, ensuring precise control of the device.

[0064] like Figure 4 , Figure 5 As shown, the stirring drum in the present invention is composed of several stirring drums connected in series, and a single stirring drum is composed of a stirring drum shell, a knife arrangement mechanism, a powder spray nozzle, a liquid curing agent spray nozzle and a high-pressure atomizing spray nozzle. The stirring drum shell is made of high-quality carbon steel and is coated with a polyethylene material coating to improve the wear resistance and corrosion resistance of the stirring drum shell.

[0065] The knife arrangement mechanism is equipped with a "T"-shaped blade to increase the contact area between the soft soil and the curing agent during the mixing process, allowing the curing agent and the soft soil to collide and mix multiple times, thereby improving the uniformity of mixing. The material is 316 stainless steel, and a polyethylene coating is provided on the surface to prevent the corrosive substances in the soil from corroding the blades and increase the service life of the knife arrangement mechanism.

[0066] Both the powder nozzle and the liquid curing agent nozzle are umbrella-shaped nozzles made of 316 stainless steel. The powder nozzle and the liquid curing agent nozzle are connected to the powder clinker pipe and the liquid curing agent feed pipe respectively. The powder or liquid curing agent can be mixed with ash and sprayed at the same time as the stirring drum is mixed. The umbrella-shaped nozzle sprays the powder or liquid curing agent in a mist evenly, which can improve the uniformity of mixing.

[0067] The high-pressure atomizing nozzle is a special tungsten carbide atomizing nozzle with good corrosion resistance, oxidation resistance and aging resistance. The aperture of the nozzle is less than 1mm. When the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through the pipeline by the high-pressure water pump, and then sprayed out through the high-pressure atomizing nozzle. On the one hand, the high-pressure atomizing nozzle can assist in blowing the curing agent into the soft soil to mix the curing agent and the soil evenly. On the other hand, it can clean the clay adhering to the blade to avoid the soil adhesion phenomenon in soft soil construction. At the same time, the high-pressure liquid generates fine vapor droplets through the high-pressure atomizing nozzle. These fine droplets can diffuse rapidly after entering the working space, absorb heat from the air to complete vaporization, and suspend in the air for a long time. It can absorb dust in the air and turn it into large particles for sedimentation, which has the dust removal effect of adsorbing dust and reducing the amount of dust.

[0068] A roadbed in-situ dust control mixing device includes a rainproof and dustproof device, a paving and mixing device, and a track running device. The rainproof and dustproof device consists of a unit frame, a top telescopic frame, a column telescopic frame, a dustproof cloth, and a rainproof cloth. The unit frame consists of a unit truss and a unit column. The bottom of the unit column is connected to a track pulley for easy movement. The unit truss and the middle of the column are provided with a slide groove to reduce the dead weight and facilitate the connection between units. The unit truss is directly welded to the column. Each unit truss is connected by a top telescopic frame, and each unit column is connected by a column telescopic frame. The paving and mixing device consists of a driving wheel and a mixing drum. The driving wheel drives the mixing drum to move horizontally along the track, and the electric motor drives the mixing drum to rotate axially to achieve uniform mixing of the soil. The track running device consists of a guide rail, a track pulley, and a driving trolley. The track pulley is used in conjunction with the guide rail to connect the bottom of the unit column; the driving trolley is driven by a motor to achieve rapid expansion and contraction of the device. The driving trolley is connected to the outermost unit frame and contacts the guide rail.

[0069] A dust control method for a roadbed in-situ dust control mixing device specifically comprises the following steps:

[0070] Installation: After the preparation work is completed, the rainproof and dustproof construction device is placed on the construction site, and the guide rails of the rainproof and dustproof device and the paving and mixing device are positioned and laid. After the track pulley at the bottom of the unit frame is fitted with the guide rails of the rainproof and dustproof device, start the driving trolley to drive the unit frame to move. The extension direction of the rainproof and dustproof device should follow the drainage direction of the site, and the length should be 30 to 50 meters, which is determined according to the geometric dimensions of the construction site. Mixing and spraying: Assemble the driving wheel and the mixing drum, and then fit the driving wheel with the guide rails of the paving and mixing device. According to the extension range of the rainproof and dustproof device, calculate the mixing volume and the amount of powder or liquid curing agent, prepare the required powder or liquid curing agent, store it in the corresponding barrel, and connect it to the powder nozzle and liquid curing agent nozzle through the powder delivery pipe and liquid curing agent delivery pipe. After setting the pressure of the nozzle pressure pump as required, start the driving wheel and the mixing drum to start mixing. While the mixing drum is rotating, the powder nozzle or liquid curing agent nozzle starts to spray outwards, which can make the mixing more uniform.

[0071] Dust control system operation: At the same time, the dust control system also starts to operate, setting the nozzle pressure pump to at least 2MPa and transporting the high-pressure liquid to the high-pressure atomizing nozzle through the pipeline, and then through the high-pressure atomizing nozzle to produce fine vapor droplets, adsorbing the dust in the air into large particles and settling, and can reduce the soft soil adhesion on the cutter mechanism. Connect the air supply column to the fan, connect the air outlet to the dust collector, and turn on the fan and dust collector at the same time to create a swirl, suck the dust to the center of the swirl, and then carry the dust that has not been processed by the high-pressure atomizing nozzle to the dust collector to complete the dust removal.

[0072] Construction process control: During construction, the rotation speed of the mixing drum is stable between 25 and 40 r / min. The driving wheel controls the movement of the mixing drum in the device, and the moving speed is controlled between 0.8 and 1.2 m / min. First, spray and mix according to 60% to 70% of the designed dosage. After the mixing drum runs back and forth in the device, stop for 3 to 5 minutes to allow the powder or liquid curing agent to fully react with the soil, and then spray and mix the remaining powder or liquid curing agent for the second time. At this time, the mixing is basically uniform. The second mixing can break up the large agglomerated soil particles, allowing the powder or liquid curing agent to enter the large agglomerated soil particles, making the mixing skeleton uniform.

[0073] End of construction: The entire construction process is carried out inside the device, effectively avoiding the influence of external environmental factors and reducing the pollution of the construction to the environment. After the construction is completed, the driving trolley can be controlled to drive the unit frame to move in the opposite direction, shrink the device to a size that is easy to carry and evacuate the site to facilitate subsequent bulldozer leveling and rolling construction. The above-mentioned specific implementation methods are used to explain the present invention and are only preferred embodiments of the present invention, rather than limiting the present invention. Within the spirit of the present invention and the scope of protection of the claims, any modifications, equivalent substitutions, improvements, etc. made to the present invention fall within the scope of protection of the present invention.

Claims

1. A roadbed in-situ dust control mixing device, characterized in that: It includes rain and dust proof device, paving and mixing device and track running device. The rain and dust proof device comprises a unit frame, a top telescopic frame, a column telescopic frame, and a dustproof cloth and a rainproof cloth. The dustproof cloth and the rainproof cloth are regulated to cover the construction area through the top telescopic frame and the column telescopic frame to block the intrusion of construction dust and rainwater and maintain the ash mixing effect; The paving and mixing device includes a driving wheel and a mixing drum. The driving wheel drives the mixing drum along a track running device to evenly mix the soft soil and the curing agent. The mixing drum includes a mixing drum shell, a knife arrangement mechanism, a powder spray nozzle, a liquid curing agent spray nozzle and a high-pressure atomizing spray nozzle. The driving wheel is started to drive the mixing drum to rotate to achieve stirring and mixing of the materials. While the mixing drum rotates, the powder spray nozzle or the liquid curing agent spray nozzle starts to spray outward to make the mixing more uniform. The high-pressure atomizing spray nozzle produces fine vapor droplets to absorb the powder in the air. The unit frame is provided with an air supply column, which is equipped with a fan, and the air outlet is connected to the dust collector. The fan and the dust collector are turned on at the same time to create a swirl flow, so that the dust is sucked to the center of the swirl flow, and the dust that has not been processed by the high-pressure atomization nozzle is carried to the dust collector to complete the dust removal; The track running device allows the drive wheels to move smoothly around the construction site.

2. A roadbed in-situ dust control mixing device and a method of using the same as claimed in claim 1, characterized in that: The rain and dustproof device comprises a unit frame, a top telescopic frame, a column telescopic frame, a dustproof cloth and a rainproof cloth. The unit frame comprises a unit truss and a unit column. The middle of the unit truss and the column are provided with a slide groove to reduce the dead weight and facilitate the connection between the units. The unit truss is directly welded to the column, and a track pulley is connected to the bottom of the column for easy movement. The sizes of the unit truss and the column can be selected according to the size of the construction site; the top telescopic frame and the column telescopic frame are designed to be adjustable, and each unit truss is connected by the top telescopic frame, and each unit column is connected by the column telescopic frame to achieve the retractability of the rain and dustproof device.

3. The roadbed in-situ dust control mixing device according to claim 1, characterized in that: The mixing drum shell is made of high-quality carbon steel and is coated with a polyethylene coating to improve the wear resistance and corrosion resistance of the mixing drum shell; The blade arrangement mechanism is provided with a T-shaped blade to increase the contact area between the soft soil and the curing agent during the mixing process. The blade is made of 316 stainless steel and a polyethylene coating is provided on the surface to prevent the blade from being corroded by corrosive substances in the soil. The powder spray head and the liquid curing agent spray head are both umbrella-shaped spray heads made of 316 stainless steel. The powder spray head and the liquid curing agent spray head are respectively connected to the powder clinker pipe and the liquid curing agent feed pipe to mix the material with the stirring drum while mixing. The umbrella-shaped spray head sprays the powder or liquid curing agent in a mist-like and uniform manner to improve the uniformity of mixing. The high-pressure atomizing nozzle is a tungsten carbide atomizing nozzle with a nozzle aperture of less than 1mm. When the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through a pipeline through a high-pressure water pump, and then sprayed out through the high-pressure atomizing nozzle. On the one hand, the high-pressure atomizing nozzle assists in blowing the curing agent into the soft soil to mix the curing agent and the soil evenly, and on the other hand, it cleans the clay adhering to the blade to avoid the soil adhesion phenomenon in soft soil construction; at the same time, the high-pressure liquid generates fine vapor droplets through the high-pressure atomizing nozzle. These fine droplets can diffuse rapidly after entering the working space, absorb heat from the air to complete vaporization, and suspend in the air for a long time. They can absorb dust in the air and turn it into large particles for sedimentation, which has the dust removal effect of adsorbing dust and reducing the amount of dust.

4. The roadbed in-situ dust control mixing device according to claim 3, characterized in that: The outer shell of the mixing drum is spirally provided with multiple T-blades, which are all tilted to improve mixing efficiency and uniformity. The electric motor drives the mixing drum to rotate axially to achieve uniform mixing of the soil. The height and width of the mixing drum can be adjusted according to the soil properties and construction area. The paving and mixing device can turn and mix the lime-mixed soil along the set track.

5. The roadbed in-situ dust control mixing device according to claim 1, characterized in that: The track running device includes a guide rail, a track pulley and a driving trolley. The track pulley is used in conjunction with the guide rail to connect the bottom of the unit column. The driving trolley is the power core of the device and is driven by a motor to achieve rapid extension and retraction of the device. The driving trolley is connected to the outermost unit frame and contacts the guide rail to provide good load distribution and smooth operation.

6. A roadbed in-situ dust control mixing device as claimed in claim 4, characterized in that: The driving trolley is equipped with an adjustable braking system to achieve rapid stopping or starting of the driving trolley.

7. A dust control method using a roadbed in-situ dust control mixing device as claimed in any one of claims 1 to 6, characterized in that: The dust control method includes primary water mist dust control, secondary rotary suction dust removal and tertiary shielding dust isolation; First-level water mist dust control: when the mixing drum is working, the high-pressure liquid is transported to the high-pressure atomizing nozzle through the pipeline by the high-pressure water pump, and then the high-pressure atomizing nozzle generates fine vapor droplets. These fine droplets can diffuse rapidly after entering the working space, absorb heat from the air to complete vaporization, and stay suspended in the air for a long time, which can absorb the dust in the air and turn it into large particles for precipitation, thus absorbing dust, reducing the amount of dust and realizing dust removal; Secondary rotary suction dust removal: When the device is working, the dust collector is connected to the exhaust port and the air is drawn out to provide axial airflow for the equipment. At the same time, when the four sides are closed, the four air supply columns are used to create an exhaust flow field in a clockwise direction to provide shear airflow, and the air cohesion is used to drive the surrounding airflow to move tangentially to form a swirl. The swirl has a strong gathering function, which can efficiently suck the dust to the center of the swirl, and then carry the dust to the dust collector to complete the dust removal. After the first and second level dust control, the remaining trace dust can be blocked by the third level dust shielding, and dustproof cloth and rainproof cloth can be used to prevent the dust from spreading outward.

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