A modified asphalt mixture production system

Abstract

The application discloses a modified asphalt mixture production system and belongs to the technical field of asphalt processing. The system comprises a mixing cylinder, a preliminary stirring mechanism, a stirring and mixing mechanism, a modifier cutting mechanism and a control system. The preliminary stirring mechanism is rotatably connected with the mixing cylinder. The stirring and mixing mechanism is rotatably connected with the preliminary stirring mechanism. The modifier cutting mechanism is arranged on the stirring and mixing mechanism and cooperates with the stirring and mixing mechanism. The system can improve the fiber dispersibility of the fiber modifier, precisely control the fiber length and enhance the interaction between the fiber and the asphalt, so that the fiber and the asphalt have more contact opportunities, the asphalt can better wrap the fiber surface and form a more stable fiber-asphalt combination, and the mechanical properties of the mixture are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of asphalt processing, and particularly relates to a modified asphalt mixture production system. BACKGROUND

[0002] Modified asphalt is asphalt mixture prepared by adding rubber, resin, polymer, ground rubber powder or other fillers as external additives (modifiers) or by taking measures such as mild oxidation of asphalt, so that the performance of asphalt or asphalt mixture is improved. The mechanism of modified asphalt is twofold, one is to change the chemical composition of asphalt, and the other is to make the modifiers uniformly distributed in the asphalt to form a certain spatial network structure, thereby improving the use effect of modified asphalt mixture.

[0003] The existing Chinese patent CN115141642B provides a modified asphalt mixture automatic production equipment and production method, relating to the technical field of asphalt processing. In order to solve the problem that the reaction between base asphalt and modifier is not thorough enough, the equipment specifically comprises a mounting frame, a hollow annular barrel is fixed on the top outer wall of the mounting frame, a connecting cylinder is fixed on the inner wall of the hollow annular barrel, and a mounting hole is opened on the outer wall of the bottom of the connecting cylinder. The production method of the mixture specifically comprises the following steps: the worker heats the appropriate amount of base asphalt to 140-150 DEG C, then pours it into the discharge cylinder through the base asphalt adding pipe, and then pours the crushed modifier into the hollow annular barrel through the modifier adding pipe. The invention uniformly 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 process of mixing the modifier and the asphalt, when the fiber material is added to the asphalt, agglomeration phenomenon easily occurs, such as lignin fiber. Since it has a certain elongated shape and is easily entangled with each other, if it is not subjected to shearing and cutting operations, it will form a ball and cannot be uniformly dispersed in the asphalt and the entire mixture system, and cannot be mixed between the asphalt and the modifier in sections, resulting in poor mixing effect when mixing. SUMMARY

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

[0006] The embodiment of the present application adopts the technical scheme: a modified asphalt mixture production system, further, the preliminary stirring mechanism comprises a stirring motor, a stirring shaft and a plurality of stirring frame bodies, the stirring motor is located at the top of the mixing cylinder, the stirring shaft is vertically arranged in the mixing cylinder and is in transmission connection between the top of the stirring shaft and the stirring motor, the plurality of stirring frame bodies are distributed at equal intervals on the stirring shaft, and the stirring shaft is provided with a mounting cavity.

[0007] Further, the stirring and mixing mechanism comprises a driving motor, a driving shaft and two horizontal stirring pieces, the driving motor is located in the mounting cavity, the driving shaft is located on the main shaft of the driving motor, and the two horizontal stirring pieces are symmetrically arranged on the driving shaft.

[0008] Further, each horizontal stirring piece comprises 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 horizontally connected to the driving shaft, respectively, the rotating bevel gear is connected to one end of the rotating shaft and is located in meshing 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 cylinder.

[0009] Further, the modifier cutting mechanism is located in the mounting frame, the modifier cutting mechanism comprises two cutting pieces distributed in an up-down manner, the two cutting pieces are in sliding fit with the mounting frame, and the mounting frame is provided with a heating rod arranged horizontally at the middle position.

[0010] Further, the cutting piece comprises a rotating motor, a transmission shaft, a rotating gear, a moving rod and a moving knife plate, the rotating motor is located in the mounting frame, the transmission shaft is in rotating connection in the mounting frame, the rotating gear is located on the transmission shaft, the moving rod is in sliding connection on the mounting frame and is provided with a moving gear slot in meshing with the rotating gear, and the bottom of the moving knife plate is provided with a plurality of upper tooth knives arranged at equal intervals.

[0011] Further, the plurality of upper tooth knives and the plurality of lower tooth knives are arranged in an interlaced manner.

[0012] Further, the bottom of the stirring shaft is further provided with a discharging and mixing mechanism, the discharging and mixing mechanism comprises a mixing auger, and the mixing auger is located at the bottom of the stirring shaft.

[0013] Further, the top of the mixing cylinder is provided with an inlet in communication, and the bottom of the mixing cylinder is provided with an outlet in communication.

[0014] Further, the top of the mixing cylinder is provided with a waste gas treater.

[0015] The above at least one technical scheme adopted by the embodiment of the present application can achieve the following beneficial effects:

[0016] Firstly, when the fiber modifier is sheared, the rotation of the motor drives the rotation of the rotating shaft, which drives the rotating gear to rotate back and forth on the moving tooth groove on the moving rod, so that the moving rod moves horizontally on the mounting frame. The reciprocating movement of the moving rod drives the upper teeth on the moving knife plate to move on the lower teeth on the lower mounting frame, shearing the fiber modifier; the fiber dispersion can be improved, the fiber length can be accurately controlled, and the interaction between the fiber and the asphalt can be enhanced; after the fiber is sheared, the surface area is relatively increased; this makes the fiber and asphalt have more contact opportunities, and the asphalt can better wrap 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 asphalt is stirred in sections in the present application, which can prevent some components from being damaged due to long-time high-intensity stirring at the beginning. For example, the asphalt mixture containing a modifier is not stirred with the modifier at the beginning to avoid the premature breakage of the molecular chain of the modifier due to strong shear, and the modifier is added and stirred specifically at the appropriate stage to fully exert the performance improvement effect of the modifier on the asphalt. For fiber materials, it can also prevent them from being excessively cut and refined at the beginning, so that they can be reasonably dispersed and play a role in enhancing the crack resistance of the mixture in the subsequent stage. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate certain illustrative embodiments of the application and together with the description serve to explain the application. In the drawings:

[0019] Figure 1 is a schematic view of the three-dimensional structure of the present application;

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

[0021] Figure 3 is a schematic view of the three-dimensional structure of the preliminary stirring mechanism in the present application;

[0022] Figure 4 is Figure 3 is an enlarged view of position A in the present application;

[0023] Figure 5 is a schematic view of the three-dimensional structure of the modifier cutting mechanism in the present application;

[0024] Figure 6 is Figure 5 is an enlarged view of position B in the present application;

[0025] Figure 7 For Figure 5 Enlarged view at C;

[0026] Reference signs:

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

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions of the present application with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the drawings.

[0030] Referring to Figures 1 to 7 The present application provides a modified asphalt mixture production system, which comprises a mixing barrel 1, wherein the mixing barrel 1 is provided with a preliminary stirring mechanism 2, the preliminary stirring mechanism 2 is rotatably connected with the mixing barrel 1; a stirring and mixing mechanism 3, wherein the stirring and mixing mechanism 3 is rotatably connected with the preliminary stirring mechanism 2 and is arranged in 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 cooperates with the stirring and mixing mechanism 3.

[0031] In use, the preliminary stirring mechanism 2 can preliminarily mix the asphalt and the modifier, and the stirring and mixing mechanism 3 can mix the asphalt and the modifier in the horizontal direction, so that the main aggregate and the asphalt are preliminarily mixed, and then the additives are added for fine stirring; different specifications of aggregate and asphalt are simply gathered to form loose mixture as a basis, and then the modifier and the additives such as fibers are added, so that they are better dispersed on the basis, the components are fully and uniformly distributed, local component difference is avoided, the overall performance of the mixture is stable, and high-quality pavement can be paved.

[0032] Segmented stirring can prevent some components from being damaged by long-term high-intensity stirring at the beginning. For example, asphalt mixture containing modifiers is not stirred with the addition of modifiers in the early stage to avoid the premature shearing of the molecular chain of the modifier, and the modifier is added and stirred at the appropriate stage to fully exert the performance improvement of the modifier on the asphalt. For fiber materials, it can also prevent them from being excessively cut and refined at the beginning, so that they can be reasonably dispersed and play a role in enhancing the crack resistance of the mixture in the subsequent stage.

[0033] Specifically, the preliminary stirring mechanism 2 includes a stirring motor 21, a stirring shaft 22, and a plurality of stirring frame bodies 23. The stirring motor 21 is located at the top of the mixing cylinder 1. The stirring shaft 22 is vertically arranged in the mixing cylinder 1 and is drivingly connected between the top of the stirring shaft 22 and the stirring motor 21. The plurality of stirring frame bodies 23 are equally spaced and distributed on the stirring shaft 22. The stirring shaft 22 is provided with a mounting cavity 24.

[0034] When the asphalt is preliminarily stirred and mixed, the stirring motor 21 works to drive the stirring shaft 22 to rotate in the mixing cylinder 1, thereby driving the plurality of stirring frame bodies 23 to rotate and preliminarily mixing 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 mounting 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. The horizontal stirring members 33 are rotatably connected to the driving shaft 32.

[0036] The two horizontally spaced horizontal stirring members 33 can mix and stir every part in the mixing cylinder 1 during the stirring and mixing of the asphalt and the modifier.

[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 horizontally rotatably connected to the driving shaft 32. The rotating bevel gears 35 are connected to one end of the rotating shafts 36 and are engaged with the upper bevel gear 34. The mounting frames 37 are located at the other end of the rotating shafts 36 and are located in the mixing cylinder 1.

[0038] When the asphalt is stirred, the driving motor 31 works to drive the driving shaft 32 to rotate, the driving shaft 32 rotates to drive the upper bevel gear 34 to rotate, the upper bevel gear 34 rotates to drive 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 horizontal position in the mixing cylinder 1 to rotate, thereby mixing and stirring the asphalt in the horizontal position, and in the process of shearing the fiber modifier, the position of the fiber modifier is driven to rotate and overturn,

[0039] When the fiber modifier rotates and overturns in the position, each part of the fiber modifier has the opportunity to contact the tooth cutter, thereby realizing more uniform stress; rotation and overturning enable the fiber to receive shearing operation from different angles. Different angles of shearing help to break some winding structures or agglomerated forms that the fiber may have. For fibers like lignin fibers that are prone to winding, shearing from a single direction may not effectively untangle the winding part, and through rotation and overturning, the tooth cutter can shear the winding part from multiple angles, more thoroughly decomposing the fiber bundle into short fibers, improving the integrity of shearing; rotation and overturning help to reduce the agglomeration of fibers during shearing.

[0040] Specifically, the modifier cutting mechanism 4 is located in the mounting frame 37, the modifier cutting mechanism 4 includes two cutting members 40 distributed upward and downward, both of the two cutting members 40 are in sliding fit with the mounting frame 37, and the mounting frame 37 is provided with a horizontally arranged heating rod 5 at the middle position.

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

[0042] Specifically, the cutting member 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 is provided with a moving gear slot 47 engaged with the rotating gear 43, and the bottom of the moving blade 45 is provided with a plurality of upper tooth cutters 46 arranged at equal intervals, and the mounting frame 37 is provided with a plurality of lower tooth cutters 38.

[0043] When the fiber modifier is sheared, 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 gear slot 47 on the moving rod 44, which drives the moving rod 44 to move horizontally on the mounting frame 37. The reciprocating movement of the moving rod 44 drives the plurality of upper tooth knives 46 on the moving knife plate 45 to move on the plurality of lower tooth knives 38 on the lower mounting frame 37 to shear the fiber modifier;

[0044] In the initial state, the fiber modifier often entangles or aggregates together. When the upper tooth knife 46 moves on the lower tooth knife 38 for shearing, the fiber bundle is cut into shorter fragments. These shorter fiber fragments are more easily dispersed uniformly between asphalt and aggregate in the subsequent asphalt mixing process. For example, if the lignin fiber exists in the form of long fiber bundle, it is difficult to be uniformly distributed in the asphalt mixture. After shearing, numerous short fibers can more fully contact with asphalt, like a "small support" dispersed between asphalt and aggregate, enhancing the overall performance of the mixture.

[0045] Different lengths of fibers have different effects on the performance of asphalt mixture. Shorter fibers are more beneficial to enhance the flexibility and fatigue resistance of the mixture, while longer fibers may have advantages in improving the tensile strength of the mixture. Through tooth knife shearing, the fiber length can be optimized according to specific engineering requirements such as road type, traffic flow, etc., to precisely improve the corresponding performance of asphalt mixture. For example, in urban roads where vehicles start and stop frequently, the anti-fatigue performance of the road surface is required to be higher, and shorter fibers obtained by tooth knife shearing can be used to enhance the anti-fatigue performance.

[0046] After the fiber is sheared, its surface area increases relatively. This allows more contact opportunities between the fiber and the asphalt, and the asphalt can better wrap around 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 transfer stress to improve the mechanical properties of the mixture.

[0047] The process of shearing the fiber can also activate the fiber surface to some extent, making some chemical bonds or functional groups on the fiber surface more easily react chemically or physically absorb with the ingredients in the asphalt. This can enhance the interfacial bonding force between the fiber and the asphalt, further improving the stability and durability of the asphalt mixture. During the shearing process of polyester fiber, some active groups on its surface are exposed, which interact with the polymer modifier in the asphalt, improving the performance of the entire mixture.

[0048] Specifically, the upper tooth cutters 46 and the lower tooth cutters 38 arranged in an interlaced manner between the upper tooth cutters 46 and the lower tooth cutters 38 are more likely to cut the modifier to a suitable length during the cutting process of the fiber modifier, so as to be mixed with the asphalt raw material.

[0049] Specifically, the bottom of the stirring shaft 22 is further provided with a discharging and mixing mechanism, and the discharging and mixing mechanism comprises a mixing auger 25 located at the bottom of the stirring shaft 22.

[0050] When the stirring shaft 22 is driven to rotate by the operation of the stirring motor 21, the mixing auger 25 is driven to stir the asphalt located at the outlet 12 of the mixing drum 1. During the flow of the asphalt from the outlet 12 of the mixing drum 1, due to the differences in physical properties such as particle size and density of different components such as aggregate and asphalt mortar, segregation is likely to occur.

[0051] The stirring action of the mixing auger 25 can maintain good fluidity and uniformity of the asphalt mixture at the outlet 12. During the rotation of the mixing auger 25, different components can be re-mixed to avoid segregation such as sinking of coarse aggregate or floating of fine aggregate. For example, in some large asphalt mixing stations, 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, and ensure the stability of the quality of the mixture;

[0052] After being stirred by the mixing auger 25, the segregation degree of the asphalt mixture can be significantly reduced. This is crucial for ensuring the quality of road construction, because the road paved with segregated mixture will have local coarse aggregate concentration or fine aggregate concentration, resulting in a decrease in the flatness of the road, uneven compaction, and early diseases such as rutting and looseness. The road 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 an inlet 11 in communication, and the bottom of the mixing drum 1 is provided with an outlet 12 in communication; the inlet 11 can put the asphalt and the modifier into the mixing drum 1 and mix them, and the outlet 12 can discharge the mixed asphalt mixture outward.

[0054] Specifically, the top of the mixing drum 1 is provided with a waste gas treater 6; the waste gas treater 6 can treat the waste gas generated during the production and mixing of the asphalt.

[0055] The above only describes the embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A modified asphalt mixture production system, characterized by, Including mixing cylinder (1), the mixing cylinder (1) is equipped with preliminary stirring mechanism (2), Preliminary stirring mechanism (2), preliminary stirring mechanism (2) is rotatably connected between mixing cylinder (1); Stirring mixing mechanism (3), the preliminary stirring mechanism (2) is equipped with stirring mixing mechanism (3), and stirring mixing mechanism (3) is rotatably connected between preliminary stirring mechanism (2); Modifier cutting mechanism (4), the modifier cutting mechanism (4) is arranged on stirring mixing mechanism (3), and the modifier cutting mechanism (4) is matched with stirring mixing mechanism (3); The preliminary stirring mechanism (2) includes stirring motor (21), stirring shaft (22) and a plurality of stirring frame bodies (23), The stirring motor (21) is located at the top of the mixing cylinder (1), the stirring shaft (22) is vertically arranged in the mixing cylinder (1), and the top of the stirring shaft (22) is drivingly connected with the stirring motor (21), A plurality of stirring frame bodies (23) are distributed equidistantly on the stirring shaft (22), and the stirring shaft (22) is provided with a mounting cavity (24); The stirring mixing mechanism (3) includes driving motor (31), driving shaft (32) and two horizontal stirring pieces (33), The driving motor (31) is located in the mounting cavity (24), the driving shaft (32) is located on the main shaft of the driving motor (31), and the two horizontal stirring pieces (33) are symmetrically arranged on the driving shaft (32), and the horizontal stirring piece (33) is rotatably connected with the driving shaft (32); Each horizontal stirring piece (33) includes 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 horizontally rotatably connected to the driving shaft (32), The rotating bevel gear (35) is connected to one end of the rotating shaft (36) and meshes with the upper bevel gear (34), and the mounting frame (37) is located at the other end of the rotating shaft (36) and in the mixing cylinder (1); The modifier cutting mechanism (4) is located in the mounting frame (37), and the modifier cutting mechanism (4) includes two cutting pieces (40) distributed upward and downward, Two cutting pieces (40) are slidingly matched with the mounting frame (37), and a heating rod (5) is horizontally arranged at the middle position of the mounting frame (37); The cutting piece (40) includes rotating motor (41), transmission shaft (42), rotating gear (43), moving rod (44) and 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), and the rotating gear (43) is located on the transmission shaft (42), The moving rod (44) is slidingly connected to the mounting frame (37), and the moving rod (44) is provided with a moving gear slot (47) engaged with the rotating gear (43), the bottom of the moving blade (45) is provided with a plurality of upper tooth blades (46) arranged at equal intervals, and the mounting frame (37) is provided with a plurality of lower tooth blades (38); A plurality of the upper tooth blades (46) and the lower tooth blades (38) are arranged in a staggered manner.

2. The modified asphalt mixture production system of claim 1, wherein: The bottom of the stirring shaft (22) is further provided with a discharging and mixing mechanism, and the discharging and mixing mechanism comprises a mixing auger (25), and the mixing auger (25) is located at the bottom of the stirring shaft (22).

3. The modified asphalt mixture production system of claim 1, wherein: The top of the mixing cylinder (1) is provided with an inlet (11) in communication, and the bottom of the mixing cylinder (1) is provided with an outlet (12) in communication.

4. The modified asphalt mixture production system of claim 1, wherein: The top of the mixing cylinder (1) is provided with a waste gas treatment device (6).

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