High-solid-content emulsified asphalt full-regeneration asphalt mixture regeneration mixing plant

Abstract

The invention belongs to the technical field of production and application of recycled asphalt, and particularly relates to a high-solid-content emulsified asphalt fully-recycled asphalt mixture regeneration mixing plant. Comprising a mixing plant body, the top of the mixing plant body is provided with a driving motor, the power end of the driving motor is connected with a rotating shaft, the rotating shaft extends into the mixing plant body, the top of the mixing plant body is provided with a feeding pipe, and the bottom of the mixing plant body is provided with a discharging pipe; the structure of an existing mixing plant is improved, the full-RAP preheating cavity and the premixing cavity are additionally arranged, the full-RAP preheating cavity is used for heating an RAP material, old asphalt is molten, meanwhile, heat preservation is conducted on the high-solid-content emulsified asphalt cavity, and the fluidity of the high-solid-content emulsified asphalt is ensured; the RAP material is preliminarily mixed with the high-solid-content emulsified asphalt, and finally, the mixture is uniformly stirred by a stirring cavity to obtain the required fully-recycled asphalt mixture.

Description

Technical Field

[0001] The invention belongs to the technical field of recycled asphalt production and application, and in particular relates to a high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant. Background Art

[0002] Although my country ranks first in the world in terms of highway mileage, under environmental conditions and traffic loads, asphalt pavements usually suffer from rutting, asphalt film peeling, looseness, grain loss, cracking, potholes and other problems before reaching their designed service life. Therefore, research on asphalt pavement regeneration is very important. As we all know, the use of waste asphalt mixture (Reclaimed Asphalt Pavement, RAP) to produce recycled asphalt mixture can not only solve the problem of asphalt resource waste, but also solve the problem of waste pollution. At the same time, the application of RAP material can not only reduce the use of fresh aggregate, but also reduce the production of new asphalt. At the same time, the addition of RAP material can also improve the dynamic modulus of the asphalt mixture, so that the recycled asphalt pavement has better anti-rutting performance.

[0003] At present, there are four main methods for preparing recycled asphalt mixtures: hot regeneration in factory, hot regeneration in situ, cold regeneration of emulsified asphalt and cold regeneration of foamed asphalt. Among them, hot regeneration in factory is the most widely used. It is mainly a way to regenerate asphalt mixtures by adding a certain amount of new asphalt, new mineral materials and modifiers such as regeneration agents to RAP. Usually, the RAP dosage is controlled at 30% to ensure better road performance. Hot mix asphalt mixture is the most commonly used asphalt mixture production method, and the mixing temperature is generally 150℃~175℃.

[0004] High-solid emulsified asphalt is a new type of road asphalt with better performance than ordinary emulsified asphalt. When the viscosity meets the technical requirements, its evaporation residue content is as high as 80% or more. At the same time, high-solid emulsified asphalt also has certain regeneration characteristics. It can be mixed with 100% RAP. At the same time, its production temperature can be reduced by about 30°C compared with hot mixing technology, which reduces energy consumption. Due to the reduction in mixing temperature, less harmful gases are produced, reducing pollution to the environment. However, before mixing, it is necessary to ensure that the original asphalt on the surface of RAP is melted. The existing mixing plant mainly considers the mixing effect, and does not consider how to mix high-solid emulsified asphalt and RAP. Therefore, it is necessary to improve the existing mixing plant to adapt it to the mixing of high-solid emulsified asphalt and full RAP. Summary of the invention

[0005] In view of the technical problem that the existing mixing plants are unable to achieve full-regeneration of asphalt mixtures with high-solid content emulsified asphalt, the present invention proposes a high-solid content emulsified asphalt full-regeneration asphalt mixture regeneration mixing plant with reasonable design, simple structure, convenient processing and capable of mixing high-solid content emulsified asphalt and full RAP material.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant, including a mixing plant body, a driving motor is arranged on the top of the mixing plant body, a rotating shaft is connected to the power end of the driving motor, the rotating shaft extends into the mixing plant body, a feeding pipe is arranged on the top of the mixing plant body, a discharging pipe is arranged on the bottom of the mixing plant body, a full RAP preheating chamber, a premixing chamber and a mixing chamber are arranged in the mixing plant body from top to bottom, the rotating shaft runs through the full RAP preheating chamber, the premixing chamber and the mixing chamber, and a high-solid content emulsified asphalt chamber is arranged on the periphery of the full RAP preheating chamber. A discharge pipe is arranged at the bottom of the full RAP preheating chamber, and a liquid spraying pipe is arranged at the bottom of the high-solid content emulsified asphalt chamber, the nozzle of the liquid spraying pipe is arranged toward the bottom of the discharge pipe nozzle, an upper stirring rod is arranged on the rotating shaft, and the upper stirring rod is located in the full RAP preheating chamber, and a partition is also arranged on the rotating shaft, and the partition is evenly distributed on the side wall of the rotating shaft in a ring shape, and the partition is located in the premixing chamber, and the partition evenly divides the premixing chamber into a plurality of divided chambers, wherein a discharge port is arranged at the bottom of any chamber, and the partition pushes the material in the divided chamber out of the discharge port under the action of the rotating shaft, and a lower stirring rod is also arranged on the rotating shaft, and the lower stirring rod is located in the mixing chamber.

[0007] Preferably, the feed pipe is arranged above the dividing chamber except for the feed opening.

[0008] Preferably, the upper stirring rod comprises a connecting rod fixed on the rotating shaft and an inclined plate obliquely arranged on the connecting rod.

[0009] Preferably, at least two evenly distributed connecting rods are provided on the rotating shaft.

[0010] Preferably, the lower stirring device comprises fixed rods fixed on the rotating shaft, and the fixed rods are evenly distributed on the rotating shaft in a ring shape.

[0011] Preferably, the rotating shaft is provided with a plurality of groups of fixing rods spaced apart vertically.

[0012] Preferably, a stirring inclined plate is arranged on the fixed rod at the bottom layer of the rotating shaft, and the stirring inclined plate is arranged obliquely on the fixed rod.

[0013] Preferably, the stirring inclined plate is provided with leakage grooves, and the leakage grooves are staggered on the stirring inclined plate.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are:

[0015] 1. The present invention provides a high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant. By improving the structure of the existing mixing plant, a full RAP preheating chamber and a premixing chamber are added. The full RAP preheating chamber is used to heat the RAP material so that the old asphalt is melted while the high-solid content emulsified asphalt chamber is insulated to ensure the fluidity of the high-solid content emulsified asphalt. At the same time, the setting of the premixing chamber is used to make the RAP material and the high-solid content emulsified asphalt preliminarily mixed. Finally, the mixing chamber is used to stir evenly to obtain the required fully recycled asphalt mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure of a high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant provided in Example 1;

[0018] Figure 2 A schematic diagram of the internal half-section structure of a high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant provided in Example 1;

[0019] Figure 3 A schematic diagram of a half-section structure from another angle inside the high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant provided in Example 1;

[0020] Figure 4 A front view of the interior of a high-solid emulsified asphalt fully recycled asphalt mixture recycling mixing plant provided in Example 1;

[0021] In the above figures, 1. mixing plant body; 11. feed pipe; 12. discharge pipe; 13. high-solid content emulsified asphalt pipe; 14. drive motor; 15. rotating shaft; 2. full RAP preheating chamber; 21. connecting rod; 22. inclined plate; 23. discharge pipe; 3. high-solid content emulsified asphalt chamber; 31. spray pipe; 4. premixing chamber; 41. partition; 42. discharge port; 5. mixing chamber; 51. fixed rod; 52. stirring inclined plate; 521. leakage chute. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0024] Embodiment 1, as Figure 1 to Figure 4 As shown, the present embodiment aims to provide a mixing plant capable of mixing high-solid content emulsified asphalt and fully recycled asphalt mixture. In order to achieve the above purpose, the high-solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant provided in the present embodiment includes a mixing plant body 1. Like the existing mixing plants, the mixing plant body 1 provided in the present embodiment is also cylindrical as a whole, and a driving motor 14 is arranged on the top thereof. The power end of the driving motor 14 is connected to a rotating shaft 15, and the rotating shaft 15 extends into the mixing plant body 1. A feeding pipe 11 is arranged on the top of the mixing plant body 1, and a discharging pipe 12 is arranged on the bottom of the mixing plant body 1. In this way, the stirring and mixing is completed under the action of the rotating shaft 15 and the stirring rod.

[0025] Considering that the mixing temperature of high-solid emulsified asphalt and full RAP is only about 120°C, but the asphalt melting of RAP material is preferably at the original temperature, in this embodiment, the mixing plant body 1 is provided with a full RAP preheating chamber 2, a premixing chamber 4 and a mixing chamber 5 from top to bottom, wherein the full RAP preheating chamber 2 is used for preheating RAP to melt the asphalt on its surface, the premixing chamber 4 is used for the preliminary mixing of full RAP material and high-solid emulsified asphalt, and the mixing chamber 5 is used for achieving the regeneration of asphalt mixture, for which the rotating shaft 15 penetrates The full RAP preheating chamber 2, the premixing chamber 4 and the mixing chamber 5 are arranged. Considering that the temperature in the full RAP preheating chamber 2 needs to be maintained at 150°C ~ 175°C, and the high-solid content emulsified asphalt can be kept flowing at 80°C, and its fluidity is optimal at 90°C, so spraying can be achieved. For this reason, a high-solid content emulsified asphalt chamber 3 is set on the periphery of the full RAP preheating chamber 2. In this way, the high-solid content emulsified asphalt chamber 3 is used to absorb the heat emitted by the full RAP preheating chamber 2 to maintain the temperature of the high-solid content emulsified asphalt, thereby ensuring the fluidity of the high-solid content emulsified asphalt.

[0026] Taking into account that the mixing process is mainly to mix the RAP material and the high-solid content emulsified asphalt evenly, in order to improve the mixing efficiency, in the present embodiment, a feed pipe 23 is provided at the bottom of the full RAP preheating chamber 2, and a liquid spraying pipe 31 is provided at the bottom of the high-solid content emulsified asphalt chamber 3, and the nozzle of the liquid spraying pipe 31 is arranged toward the bottom of the nozzle of the feed pipe 23, so that the falling RAP material will be sprayed with the high-solid content emulsified asphalt, thus ensuring a certain mixing effect and improving the later mixing effect.

[0027] Considering that the main heating methods of existing mixing plants are hot air heating or microwave heating, in order to improve the heating efficiency, in this embodiment, an upper stirring rod is provided on the rotating shaft 15, and the upper stirring rod is located in the full RAP preheating chamber 2. In this way, under the action of the upper stirring rod, the melting efficiency can be effectively improved and the overall mixing efficiency can be improved.

[0028] In order to improve the effect of the spraying and make the surface of the RAP material bonded with high-solid content emulsified asphalt as much as possible, in the present embodiment, a partition 41 is also provided on the rotating shaft 15, and the partition 41 is vertically arranged and evenly distributed on the side wall of the rotating shaft 15 in a ring shape, and the partition 41 is in the premixing chamber 4, and the partition 41 divides the premixing chamber 4 evenly into a plurality of divided chambers, wherein a discharge port 42 is provided at the bottom of any chamber, so that the RAP material falling from the discharge pipe 23 will fall on the bottom of the premixing chamber 4 after being sprayed with high-solid content emulsified asphalt, and it will roll to a certain extent under the push of the partition 41, so as to ensure that its surface is bonded with high-solid content emulsified asphalt, and at the same time, the partition 41 pushes the material in the divided chamber from the discharge port 42 under the action of the rotating shaft 15 into the mixing chamber 5, and a lower stirring rod is also provided on the rotating shaft 15, and the lower stirring rod is in the mixing chamber 5. Finally, mixing is achieved, and the temperature of the mixing chamber 5 is 120°C.

[0029] Through the above settings, not only the mixing of full RAP material and high-solid content emulsified asphalt is ensured, but also the mixing speed is improved to achieve the goals of energy saving and high efficiency.

[0030] Considering that the rotation speed of the rotating shaft 15 is not fast, but the amount of material that can be discharged by the discharge pipe 23 is limited, in this embodiment, the discharge pipe 23 is arranged above the dividing chamber except for the discharge port 42. If it is arranged above the dividing chamber with the discharge port 42, it will directly enter the mixing chamber 5 through the discharge port 42, making the premixing chamber 4 here meaningless. In this embodiment, a total of 8 partitions 41 are arranged, and for this reason, 7 discharge pipes 23 are arranged.

[0031] In order to increase the melting speed of the asphalt in the RAP material, in this embodiment, the upper stirring rod includes a connecting rod 21 fixed on the rotating shaft 15 and an inclined plate 22 obliquely arranged on the connecting rod 21. The inclined plate 22 is slightly spaced from the bottom of the full RAP preheating chamber 2. The purpose of setting the inclined plate 22 is to scoop up the RAP material at the bottom, while the upper RAP material falls, forming an upper and lower exchange to improve the stirring effect. At the same time, the upper stirring rod also includes a group of connecting rods 21 without the inclined plate 22, the purpose of which is to stir the upper RAP material. Considering that the material to be stirred is RAP material, in order to ensure strength, the connecting rod 21 is a rectangular rod.

[0032] In order to improve the stirring effect, at least two evenly distributed connecting rods 21 are provided on the rotating shaft 15. In this embodiment, a total of four connecting rods 21 are provided in one layer, and because they are evenly distributed, the angle between the connecting rods 21 is 90°.

[0033] At the same time, in order to improve the stirring effect of the mixing chamber 5, in this embodiment, the lower stirring includes a fixing rod 51 fixed on the rotating shaft 15, and the fixing rod 51 is evenly distributed on the rotating shaft 15 in a ring shape. The fixing rod 51 is also a rectangular rod like the connecting rod 21, and four of them are also arranged on each layer.

[0034] Considering the height of the mixing chamber 5 and the large amount of materials to be mixed, a plurality of groups of fixing rods 51 spaced apart from each other are provided on the rotating shaft 15. In this embodiment, four groups (layers) are provided.

[0035] In order to improve the stirring effect, so that the upper and lower materials can exchange positions and fully realize all-round mixing, in this embodiment, a stirring inclined plate 52 is provided on the fixed rod 51 at the bottom layer of the rotating shaft 15, and the stirring inclined plate 52 is obliquely arranged on the fixed rod 51. Because it is at the bottom layer, in this embodiment, the stirring inclined plate 52 is not a simple flat plate, but a design with a thick bottom and a thin top. The purpose of such a design is to improve the overall strength. At the same time, the setting of the stirring inclined plate 52 also facilitates the upward movement of the bottom material.

[0036] Considering that there are too many materials at the bottom, the setting of the stirring inclined plate 52 increases the difficulty of stirring. Therefore, in order to reduce the difficulty of stirring, the stirring inclined plate 52 is provided with a leakage groove 521, and the leakage groove 521 is staggered on the stirring inclined plate 52. In this way, a certain amount of materials brought up by the stirring inclined plate 52 leaks out from the leakage groove 521, thereby reducing the difficulty of stirring and ensuring the safe use of the driving motor 14.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high-solid emulsified asphalt fully recycled asphalt mixture recycling mixing plant, comprising a mixing plant body, a driving motor is arranged on the top of the mixing plant body, a power end of the driving motor is connected to a rotating shaft, the rotating shaft extends into the mixing plant body, a feeding pipe is arranged on the top of the mixing plant body, and a discharging pipe is arranged on the bottom of the mixing plant body, characterized in that: A full RAP preheating chamber, a premixing chamber and a mixing chamber are arranged in the mixing plant body from top to bottom, the rotating shaft runs through the full RAP preheating chamber, the premixing chamber and the mixing chamber, a high-solid content emulsified asphalt chamber is arranged on the periphery of the full RAP preheating chamber, a discharge pipe is arranged at the bottom of the full RAP preheating chamber, a liquid spraying pipe is arranged at the bottom of the high-solid content emulsified asphalt chamber, and the nozzle of the liquid spraying pipe is arranged toward the bottom of the nozzle of the discharge pipe, an upper stirring rod is arranged on the rotating shaft, and the upper stirring rod is in the full RAP preheating chamber, and a partition is also arranged on the rotating shaft, and the partition is evenly distributed on the side wall of the rotating shaft in an annular shape, and the partition is in the premixing chamber, and the partition evenly divides the premixing chamber into a plurality of divided chambers, wherein a discharge port is arranged at the bottom of any chamber, and the partition pushes the material in the divided chamber out of the discharge port under the action of the rotating shaft, and a lower stirring rod is also arranged on the rotating shaft, and the lower stirring rod is in the mixing chamber.

2. A high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 1, characterized in that: The feeding pipe is arranged above the dividing chamber except for the feeding opening.

3. The high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 1, characterized in that: The upper stirring rod comprises a connecting rod fixed on the rotating shaft and an inclined plate obliquely arranged on the connecting rod.

4. A high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 3, characterized in that: At least two evenly distributed connecting rods are arranged on the rotating shaft.

5. The high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 1, characterized in that: The lower stirring device comprises a fixing rod fixed on the rotating shaft, and the fixing rod is evenly distributed on the rotating shaft in a ring shape.

6. A high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 5, characterized in that: The rotating shaft is provided with a plurality of groups of fixing rods which are arranged at intervals up and down.

7. A high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 6, characterized in that: A stirring inclined plate is arranged on the fixed rod at the bottom layer of the rotating shaft, and the stirring inclined plate is arranged obliquely on the fixed rod.

8. The high solid content emulsified asphalt fully recycled asphalt mixture recycling mixing plant according to claim 7, characterized in that: The stirring inclined plate is provided with leakage grooves, and the leakage grooves are staggeredly arranged on the stirring inclined plate.

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