Modified asphalt mixture production system

Abstract

The invention discloses a modified asphalt mixture production system, and belongs to the technical field of asphalt processing, the modified asphalt mixture production system comprises a mixing cylinder, the mixing cylinder is provided with a primary stirring mechanism, and the primary stirring mechanism is rotatably connected with the mixing cylinder; a stirring and mixing mechanism; a stirring and mixing mechanism is arranged in the primary stirring mechanism, and the stirring and mixing mechanism is rotationally connected with the primary stirring mechanism; and the modifier cutting-off mechanism is arranged on the stirring and mixing mechanism, and the modifier cutting-off mechanism and the stirring and mixing mechanism are matched with each other. According to the invention, the fiber dispersibility in the fiber modifier can be improved, the fiber length can be accurately controlled, and the interaction between the fiber and the asphalt can be enhanced, so that more contact opportunities exist between the fiber and the asphalt, and the asphalt can better wrap the surface of the fiber to form a more stable fiber-asphalt combination; the mechanical property of the mixture is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt processing, and in particular relates to a modified asphalt mixture production system. Background Art

[0002] Modified asphalt is an asphalt mixture made by adding external additives (modifiers) such as rubber, resin, high molecular polymer, ground rubber powder or other fillers, or taking measures such as mild oxidation of asphalt to improve the performance of asphalt or asphalt mixture. There are two mechanisms for modifying asphalt. One is to change the chemical composition of asphalt, and the other is to make the modifier evenly distributed in the asphalt to form a certain spatial network structure, thereby improving the use effect of the modified asphalt mixture.

[0003] The existing Chinese patent publication number CN115141642B provides an automated production device and production method for modified asphalt mixture, which relates to the field of asphalt processing technology; in order to solve the problem that the reaction between the base asphalt and the modifier is not thorough enough; the device specifically includes a mounting frame, a hollow annular barrel is fixed on the top outer wall of the mounting frame, a connecting barrel is fixed on the inner wall of the hollow annular barrel, and a mounting hole is opened on the bottom outer wall of the connecting barrel; the production method of the mixture specifically includes the following steps: the staff heats an appropriate amount of base asphalt to 140-150°C and pours it into the lower barrel through the base asphalt adding pipe, and then pours the crushed modifier into the hollow annular barrel through the modifier adding pipe. The invention evenly sprays the crushed modifier on the base asphalt cut into small pieces, which can effectively improve the reaction effect between the modifier and the base asphalt, thereby improving the overall use effect of the modified asphalt mixture.

[0004] However, in the existing process of mixing the modifier and asphalt, when the fiber material is added to the asphalt, agglomeration is likely to occur. For example, lignin fibers have a certain slender shape and are easily entangled with each other. If they are not sheared and cut, they will clump together and cannot be evenly dispersed in the asphalt and the entire mixture system. The asphalt and the modifier cannot be mixed in sections, resulting in poor mixing effect during mixing. Summary of the invention

[0005] The embodiment of the present invention provides a modified asphalt mixture production system to solve the problems in the prior art.

[0006] The embodiment of the present invention adopts the following technical scheme: a modified asphalt mixture production system, further, the preliminary stirring mechanism includes a stirring motor, a stirring shaft and a plurality of stirring frames, the stirring motor is located at the top of the mixing drum, the stirring shaft is vertically arranged in the mixing drum and the top of the stirring shaft is transmission-connected to the stirring motor, the plurality of stirring frames are evenly spaced up and down on the stirring shaft, and an installation cavity is provided in the stirring shaft.

[0007] Furthermore, the stirring and mixing mechanism includes a driving motor, a driving shaft and two horizontal stirring members, the driving motor is located in the installation cavity, the driving shaft is located on the main shaft of the driving motor, the two horizontal stirring members are symmetrically arranged on the driving shaft, and the horizontal stirring members are rotationally connected to the driving shaft.

[0008] Furthermore, each horizontal stirring element includes an upper bevel gear, three rotating bevel gears, three rotating shafts and three mounting frames, the upper bevel gear is connected to the driving shaft, the three rotating shafts are respectively connected to the driving shaft in horizontal rotation, the rotating bevel gear is connected to one end of the rotating shaft and is meshed with the upper bevel gear, and the mounting frame is located at the other end of the rotating shaft and is located in the mixing barrel.

[0009] Furthermore, the modifier cutting mechanism is located in the installation frame, and includes two cutting pieces distributed up and down, both of which are slidably matched with the installation frame, and a horizontally arranged heating rod is provided in the middle position of the installation frame.

[0010] Furthermore, the cutting piece includes a rotating motor, a transmission shaft, a rotating gear, a moving rod and a moving knife plate, the rotating motor is located in an installation frame, the transmission shaft is rotatably connected in the installation frame, the rotating gear is located on the transmission shaft, the moving rod is slidably connected to the installation frame and the moving rod is provided with a moving tooth groove meshing with the rotating gear, the bottom of the moving knife plate is provided with a plurality of upper tooth knives arranged at equal intervals, and a plurality of lower tooth knives are provided in the installation frame.

[0011] Furthermore, the plurality of upper tooth cutters and the plurality of lower tooth cutters are arranged alternately.

[0012] Furthermore, a material feeding and mixing mechanism is also provided at the bottom of the stirring shaft, and the material feeding and mixing mechanism includes a mixing auger, and the mixing auger is located at the bottom of the stirring shaft.

[0013] Furthermore, the top of the mixing cylinder is provided with a connected inlet, and the bottom of the mixing cylinder is provided with a connected outlet.

[0014] Furthermore, an exhaust gas processor is provided on the top of the mixing cylinder.

[0015] At least one of the above technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0016] Firstly, when the present invention shears the fiber modifier, the rotating motor drives the rotating shaft to rotate, which drives the rotating gear to rotate back and forth on the moving tooth groove on the moving rod, so that the moving rod can move horizontally back and forth on the mounting frame. The reciprocating movement of the moving rod drives the several upper tooth knives on the moving blade to move on the several lower tooth knives on the lower mounting frame to shear the fiber modifier; the fiber dispersion can be improved, the fiber length can be accurately controlled, and the interaction between the fiber and asphalt can be enhanced; after the fiber is sheared, its surface area is relatively increased; this allows more contact opportunities between the fiber and the asphalt, and the asphalt can be better wrapped on the fiber surface to form a more stable fiber-asphalt combination; when the asphalt mixture is subjected to external force, this good combination can more effectively transmit stress and improve the mechanical properties of the mixture.

[0017] Secondly, the present invention adopts segmented stirring of asphalt, which can prevent some components from being damaged due to long-term high-intensity stirring at the beginning. For example, for asphalt mixture containing modifier, the modifier is not added for stirring in the early stage to avoid the modifier being subjected to strong shearing too early and causing the molecular chain to break. The modifier is added and stirred in a targeted manner at the appropriate stage, which can give full play to the improvement effect of the modifier on the performance of asphalt; for fiber-like materials, it can also prevent them from being over-cut and refined at the beginning, so that they can be reasonably dispersed in the subsequent stage and play a role in enhancing the crack resistance of the mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a sectional view of the three-dimensional structure of the present invention;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the preliminary stirring mechanism in the present invention;

[0022] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the modifier cutting mechanism in the present invention;

[0024] Figure 6 for Figure 5 The enlarged view of point B in the middle;

[0025] Figure 7 for Figure 5 Enlarged view of point C in the middle;

[0026] Reference numerals:

[0027] Mixing cylinder 1, inlet 11, outlet 12, preliminary stirring mechanism 2, stirring motor 21, stirring shaft 22, stirring frame 23, mounting chamber 24, mixing auger 25, stirring and mixing mechanism 3, driving motor 31, driving shaft 32, horizontal stirring member 33, upper bevel gear 34, rotating bevel gear 35, rotating shaft 36, mounting frame 37, lower tooth knife 38, modifier cutting mechanism 4, cutting member 40, rotating motor 41, transmission shaft 42, rotating gear 43, moving rod 44, moving knife plate 45, upper tooth knife 46, moving tooth groove 47, heating rod 5, exhaust gas processor 6. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] Reference Figures 1 to 7 As shown, an embodiment of the present invention provides a modified asphalt mixture production system, including a mixing drum 1, wherein the mixing drum 1 is provided with a preliminary stirring mechanism 2, wherein the preliminary stirring mechanism 2 is rotatably connected to the mixing drum 1; a stirring and mixing mechanism 3; wherein the preliminary stirring mechanism 2 is provided with a stirring and mixing mechanism 3, wherein the stirring and mixing mechanism 3 is rotatably connected to the preliminary stirring mechanism 2; and a modifier cutting mechanism 4, wherein the modifier cutting mechanism 4 is arranged on the stirring and mixing mechanism 3, and the modifier cutting mechanism 4 and the stirring and mixing mechanism 3 cooperate with each other.

[0031] During use, the preliminary mixing mechanism 2 can be used to perform preliminary mixing of the asphalt and the modifier, while the mixing mechanism 3 can perform mixing of the asphalt and the modifier in the horizontal direction. Preliminary mixing is first performed to roughly mix the main aggregate with the asphalt, and then additives are added for fine mixing. Aggregates of different specifications are first simply gathered with the asphalt to form a loose mixture as a basis, and then after adding additives such as modifiers and fibers, they can be better dispersed on the existing basis, so that the various components are fully and evenly distributed, avoiding local component differences, ensuring the overall stability of the mixture, and helping to pave a high-quality road surface.

[0032] Stirring in stages can prevent some components from being damaged by long-term, high-intensity stirring at the beginning. For example, for asphalt mixtures containing modifiers, it is best not to add modifiers for stirring in the early stages to prevent the modifiers from being sheared too early and causing molecular chains to break. Adding modifiers and stirring them in a targeted manner at the appropriate stage can fully exert the effect of modifiers on improving asphalt performance. For fiber materials, it can also prevent them from being over-cut and refined at the beginning, so that they can be reasonably dispersed in the subsequent stages and play a role in enhancing the crack resistance of the mixture.

[0033] Specifically, the preliminary stirring mechanism 2 includes a stirring motor 21, a stirring shaft 22 and a plurality of stirring frames 23. The stirring motor 21 is located at the top of the mixing drum 1. The stirring shaft 22 is vertically arranged in the mixing drum 1 and the top of the stirring shaft 22 is transmission-connected to the stirring motor 21. The plurality of stirring frames 23 are evenly spaced up and down on the stirring shaft 22. An installation cavity 24 is provided in the stirring shaft 22.

[0034] When the asphalt is initially stirred and mixed, the stirring motor 21 drives the stirring shaft 22 to rotate in the mixing barrel 1, thereby driving a plurality of stirring frames 23 to rotate, and performing preliminary mixing of the asphalt and the modifier.

[0035] Specifically, the stirring and mixing mechanism 3 includes a driving motor 31, a driving shaft 32 and two horizontal stirring members 33. The driving motor 31 is located in the installation cavity 24, and the driving shaft 32 is located on the main shaft of the driving motor 31. The two horizontal stirring members 33 are symmetrically arranged on the driving shaft 32 in an upper and lower manner, and the horizontal stirring members 33 are rotationally connected to the driving shaft 32.

[0036] During the process of stirring and mixing the asphalt and the modifier, two horizontal stirring members 33 spaced apart from each other above each other can make every part of the mixing drum 1 be mixed and stirred.

[0037] Specifically, each horizontal stirring member 33 includes an upper bevel gear 34, three rotating bevel gears 35, three rotating shafts 36 and three mounting frames 37. The upper bevel gear 34 is connected to the driving shaft 32. The three rotating shafts 36 are respectively connected to the driving shaft 32 in horizontal rotation. The rotating bevel gear 35 is connected to one end of the rotating shaft 36 and is meshed with the upper bevel gear 34. The mounting frame 37 is located at the other end of the rotating shaft 36 and is located in the mixing barrel 1.

[0038] When the asphalt is stirred, the driving motor 31 drives the driving shaft 32 to rotate, and the rotation of the driving shaft 32 drives the upper bevel gear 34 to rotate. The rotation of the upper bevel gear 34 drives the three rotating bevel gears 35 to rotate, thereby driving the three rotating shafts 36 to rotate and the three mounting frames 37 to rotate. The mounting frame 37 rotates in the mixing drum 1 to rotate horizontally, thereby mixing and stirring the asphalt in the horizontal position. In the process of shearing the fiber modifier, the position of the fiber modifier can also be driven to rotate and flip.

[0039] When the fiber modifier rotates and flips in position, each part of it has the opportunity to contact the tooth knife, thereby achieving more uniform force; rotation and flipping allow the fiber to be sheared from different angles. Shearing at different angles helps to break up some entangled structures or agglomeration forms that may exist in the fiber. For fibers such as lignin fibers that are easily entangled with each other, cutting from a single direction may not effectively untie the entangled parts. By rotating and flipping, the tooth knife can cut the entangled parts from multiple angles, breaking down the fiber bundles into short fibers more thoroughly and improving the integrity of the shearing; rotation and flipping help reduce fiber agglomeration during the shearing process.

[0040] Specifically, the modifier cutting mechanism 4 is located in the installation frame 37 and includes two cutting pieces 40 distributed up and down. Both of the cutting pieces 40 are slidably matched with the installation frame 37. A horizontally arranged heating rod 5 is provided in the middle position of the installation frame 37.

[0041] During the rotation of the mounting frame 37, the heating rod 5 works to heat the mixed asphalt, so that the asphalt and the modifier are better mixed and the two are combined with each other.

[0042] Specifically, the cutting piece 40 includes a rotating motor 41, a transmission shaft 42, a rotating gear 43, a moving rod 44 and a moving blade 45. The rotating motor 41 is located in the mounting frame 37, the transmission shaft 42 is rotatably connected in the mounting frame 37, the rotating gear 43 is located on the transmission shaft 42, the moving rod 44 is slidably connected to the mounting frame 37, and the moving rod 44 is provided with a moving tooth groove 47 that meshes with the rotating gear 43, the bottom of the moving blade 45 is provided with a plurality of upper tooth knives 46 arranged at equal intervals, and a plurality of lower tooth knives 38 are provided in the mounting frame 37.

[0043] When cutting the fiber modifier, the rotating motor 41 drives the rotating shaft 36 to rotate, which drives the rotating gear 43 to rotate back and forth on the moving tooth groove 47 on the moving rod 44, so that the moving rod 44 moves horizontally back and forth on the mounting frame 37. The reciprocating movement of the moving rod 44 drives the upper tooth knives 46 on the moving blade 45 to move on the lower tooth knives 38 on the lower mounting frame 37, so as to cut the fiber modifier;

[0044] In the initial state, fiber modifiers tend to be entangled or aggregated with each other. When the upper tooth knife 46 moves on the lower tooth knife 38 to cut, the fiber bundles are cut into shorter segments. These shorter fiber segments are more easily dispersed between asphalt and aggregate in the subsequent asphalt mixing process. For example, if lignin fibers exist in the form of long fiber bundles, it is difficult to be evenly distributed in the asphalt mixture. After cutting, many short fibers can contact with asphalt more fully and are dispersed between asphalt and aggregate like "small brackets", which enhances the integrity of the mixture.

[0045] Fibers of different lengths have different effects on the performance of asphalt mixtures; shorter fibers are more conducive to enhancing the flexibility and fatigue resistance of the mixture, while longer fibers may be more advantageous in improving the tensile strength of the mixture; through toothed knife shearing, the fiber length can be optimized according to specific engineering requirements such as road type, traffic flow, etc., so as to accurately improve the corresponding performance of the asphalt mixture; for example, on urban roads, vehicles start and stop frequently, and the fatigue resistance of the road surface is required to be high, so the fatigue resistance can be enhanced by obtaining slightly shorter fibers through toothed knife shearing;

[0046] After the fiber is cut, its surface area increases relatively; this allows more contact opportunities between the fiber and asphalt, so that the asphalt can be better wrapped on the fiber surface to form a more stable fiber-asphalt combination; when the asphalt mixture is subjected to external forces, this good combination can more effectively transfer stress and improve the mechanical properties of the mixture.

[0047] The process of cutting the fibers can also "activate" the fiber surface to a certain extent, making some chemical bonds or functional groups on the fiber surface more likely to chemically react or physically adsorb with the components in the asphalt. This can enhance the interfacial bonding between the fiber and the asphalt, further improving the stability and durability of the asphalt mixture. During the cutting process, some active groups on the surface of the polyester fiber are exposed and interact with the polymer modifier in the asphalt, improving the performance of the entire mixture.

[0048] Specifically, the upper tooth knives 46 and the lower tooth knives 38 that are staggered with each other can more easily cut the fiber-type modifier into a suitable length during the process of cutting the fiber-type modifier so as to mix it with the asphalt raw material.

[0049] Specifically, a material feeding and mixing mechanism is further provided at the bottom of the stirring shaft 22 . The material feeding and mixing mechanism includes a mixing auger 25 . The mixing auger 25 is located at the bottom of the stirring shaft 22 .

[0050] When the stirring motor 21 drives the stirring shaft 22 to rotate, the mixing auger 25 is driven to stir the asphalt located at the outlet 12 of the mixing drum 1. In the process of asphalt flowing out of the outlet 12 of the mixing drum 1, segregation is likely to occur due to the differences in physical properties such as particle size and density of different components such as aggregates and asphalt mortar.

[0051] The stirring action of the mixing auger 25 can keep the asphalt mixture at the outlet 12 with good fluidity and uniformity. During the rotation of the mixing auger 25, the different components can be remixed to avoid segregation such as coarse aggregate sinking or fine aggregate floating. For example, in some large asphalt mixing plants, when the asphalt mixture is ready to be discharged for road paving, the stirring of the mixing auger 25 can effectively prevent segregation caused by gravity and flow inertia, ensuring the quality of the mixture is stable;

[0052] The segregation degree of the asphalt mixture after being stirred by the mixing auger 25 can be significantly reduced. This is crucial to ensure the quality of road construction, because the road surface paved with segregated mixture will have local coarse aggregate concentration or fine aggregate concentration, resulting in reduced road surface flatness and uneven compaction, which is prone to early diseases such as rutting and looseness. The road surface paved with the mixture stirred by the mixing auger 25 has a more uniform structure and a longer service life.

[0053] Specifically, the top of the mixing drum 1 is provided with a connected inlet 11, and the bottom of the mixing drum 1 is provided with a connected outlet 12; the inlet 11 can put asphalt and modifier into the mixing drum 1 and stir and mix them, and the outlet 12 can discharge the mixed asphalt mixture to the outside.

[0054] Specifically, a waste gas processor 6 is provided on the top of the mixing cylinder 1; the waste gas processor 6 can process the waste gas generated by mixing and stirring in asphalt production.

[0055] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A modified asphalt mixture production system, characterized in that: The mixing drum (1) comprises a mixing drum (1) provided with a preliminary stirring mechanism (2). A preliminary stirring mechanism (2), wherein the preliminary stirring mechanism (2) is rotationally connected to the mixing cylinder (1); A stirring and mixing mechanism (3), wherein the stirring and mixing mechanism (3) is provided inside the preliminary stirring mechanism (2), and the stirring and mixing mechanism (3) is rotatably connected to the preliminary stirring mechanism (2); The modifier cutting mechanism (4) is arranged on the stirring and mixing mechanism (3), and the modifier cutting mechanism (4) and the stirring and mixing mechanism (3) cooperate with each other.

2. A modified asphalt mixture production system according to claim 1, characterized in that: The preliminary stirring mechanism (2) comprises a stirring motor (21), a stirring shaft (22) and a plurality of stirring frames (23). The stirring motor (21) is located at the top of the mixing drum (1), the stirring shaft (22) is vertically arranged in the mixing drum (1), and the top of the stirring shaft (22) is transmission-connected to the stirring motor (21). A plurality of stirring frames (23) are distributed vertically and equidistantly on the stirring shaft (22), and a mounting cavity (24) is provided in the stirring shaft (22).

3. A modified asphalt mixture production system according to claim 2, characterized in that: The stirring and mixing mechanism (3) comprises a driving motor (31), a driving shaft (32) and two horizontal stirring members (33). The driving motor (31) is located in the installation cavity (24), the driving shaft (32) is located on the main shaft of the driving motor (31), the two horizontal stirring members (33) are symmetrically arranged on the driving shaft (32) up and down, and the horizontal stirring members (33) are rotationally connected to the driving shaft (32).

4. A modified asphalt mixture production system according to claim 3, characterized in that: Each horizontal stirring member (33) comprises an upper bevel gear (34), three rotating bevel gears (35), three rotating shafts (36) and three mounting frames (37). The upper bevel gear (34) is connected to the driving shaft (32), and the three rotating shafts (36) are respectively connected to the driving shaft (32) in a horizontally rotatable manner. The rotating bevel gear (35) is connected to one end of the rotating shaft (36) and is meshed with the upper bevel gear (34), and the mounting frame (37) is located at the other end of the rotating shaft (36) and is located inside the mixing barrel (1).

5. A modified asphalt mixture production system according to claim 4, characterized in that: The modifier cutting mechanism (4) is located in the installation frame (37), and the modifier cutting mechanism (4) comprises two cutting pieces (40) distributed in an upper and lower manner. The two cutting pieces (40) are slidably matched with the installation frame (37), and a horizontally arranged heating rod (5) is provided at the middle position of the installation frame (37).

6. A modified asphalt mixture production system according to claim 5, characterized in that: The cutting member (40) comprises a rotating motor (41), a transmission shaft (42), a rotating gear (43), a moving rod (44) and a moving blade (45). The rotating motor (41) is located in the installation frame (37), the transmission shaft (42) is rotatably connected in the installation frame (37), and the rotating gear (43) is located on the transmission shaft (42). The moving rod (44) is slidably connected to the mounting frame (37) and is provided with a moving tooth groove (47) meshing with the rotating gear (43). The bottom of the moving knife plate (45) is provided with a plurality of upper tooth knives (46) arranged at equal intervals, and the mounting frame (37) is provided with a plurality of lower tooth knives (38).

7. A modified asphalt mixture production system according to claim 6, characterized in that: The plurality of upper tooth knives (46) and the plurality of lower tooth knives (38) are arranged alternately.

8. A modified asphalt mixture production system according to claim 1, characterized in that: A material feeding and mixing mechanism is also provided at the bottom of the stirring shaft (22), and the material feeding and mixing mechanism comprises a mixing auger (25), and the mixing auger (25) is located at the bottom of the stirring shaft (22).

9. A modified asphalt mixture production system according to claim 1, characterized in that: The top of the mixing cylinder (1) is provided with a communicating inlet (11), and the bottom of the mixing cylinder (1) is provided with a communicating outlet (12).

10. A modified asphalt mixture production system according to claim 1, characterized in that: An exhaust gas processor (6) is provided on the top of the mixing cylinder (1).

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