An asphalt mixture mixing plant

Abstract

The application discloses a kind of asphalt mixture mixing device, including support, stirring drum, stirring assembly and asphalt spraying component, stirring drum both ends are open and are equipped with guide groove;Two groups of rack are symmetrically equipped with in the end of stirring drum, one end is also equipped with guide rail and sliding seat slidingly connected on guide rail;Stirring assembly includes the edge plate that is inserted in guide groove and can move up and down with gap;Inner gear ring is equipped on the edge plate, transmission mechanism includes center wheel and a plurality of planet wheel with center wheel and inner gear ring simultaneously meshing, center wheel and planet wheel are all fixedly connected with stirring shaft, and stirring blade is equipped on stirring shaft;Half gear is equipped on outer cover plate, and half gear is alternately meshed with rack on both sides of stirring drum in rotating process.The revolution and rotation of planetary gear train are combined with the lifting movement driven by half gear and rack in the application, avoid the problem of stirring dead angle and material segregation, improve the uniformity of mixture.

Description

Technical Field

[0001] This invention belongs to the field of asphalt processing, and specifically relates to an asphalt mixture mixing device. Background Technology

[0002] Currently, the mainstream asphalt mixture preparation process in the industry has formed a standardized system, specifically including four key steps: aggregate pretreatment, grading and screening, precise proportioning, and multi-component mixing. First, aggregates of different specifications, such as basalt and limestone, are conveyed to a drying drum via a conveyor belt and heated to 160-180℃ using fuel oil or natural gas, while removing moisture from the aggregate surface to prevent "whitening" during subsequent mixing with asphalt. Then, the heated aggregates enter a vibrating screen, where they are separated into aggregates of different sizes (5-10mm, 10-15mm, 15-20mm) through screens of different apertures and stored in corresponding hot aggregate bins to ensure the accuracy of subsequent proportioning. Next, according to the asphalt mixture gradation requirements of the engineering design, the unloading volume of each hot aggregate bin is controlled by a weighing sensor, and aggregates of different sizes are conveyed to the mixing device according to a preset weight ratio. Finally, mineral powder and modified asphalt are added to the mixing device in sequence, and the mechanical action of the mixing device achieves uniform mixing of aggregates, mineral powder, and asphalt, forming an asphalt mixture that meets construction requirements.

[0003] However, in the above preparation process, the mixing efficiency and uniformity of the mixing device have always been key bottlenecks restricting production quality. In traditional asphalt mixture mixing devices, the mixing blades are mostly installed in a fixed position, meaning the blades only rotate circumferentially with the mixing shaft, providing only circumferential shear mixing force to the mixture. This mixing method has obvious drawbacks: during the mixing process, the mixture located between two adjacent mixing blades is difficult to receive effective mixing force, forming local "mixing dead zones," leading to local segregation of the mixture. At the same time, the existence of "mixing dead zones" also prolongs the overall mixing time, reduces the preparation efficiency of asphalt mixtures, and makes it difficult to meet the continuous, large-scale supply requirements of asphalt mixtures for large-scale projects such as highway construction.

[0004] To address the "dead zone" problem in traditional mixing devices, the industry has undertaken related technological improvements. For example, CN119926228B discloses an asphalt mixture processing mixer. This technical solution employs a semi-circular bottom structure mixing pot. Circular plates with fixed rods in the center are mounted on both sides of the inner wall of the mixing pot, with the center of the circular plates aligned with the center of the semi-circular bottom. Inside the mixing pot, three sets of rotating mixing components are arranged in a circular array around the center of the circular plates. Each mixing component includes a mixing shaft and mixing blades fixed to the shaft. The core improvement lies in using a transmission mechanism to create a combined "revolution + rotation" motion for the three mixing components: on one hand, the three mixing components revolve forward around the center of the circular plate as a whole, expanding the mixing coverage area; on the other hand, the meshing transmission between the gear ring and the gear at the end of the mixing shaft causes each mixing shaft to rotate in the opposite direction of the revolution, thus forming three circular mixing zones within the mixing pot. Through this reverse compound motion, the technical solution can construct complex mixing paths, reduce the "mixing dead zones" present in traditional fixed mixing blades, and at the same time drive the mixture near the mixing shaft to migrate with the revolution, further improving the mixing uniformity.

[0005] Although the CN119926228B patent technology has made some breakthroughs in improving mixing uniformity, the device still has significant performance limitations in actual mass production scenarios, mainly reflected in the contradiction between mixing range and production efficiency: To achieve a combined "revolution + rotation" motion, this technical solution concentrates three sets of mixing components in the lower area of ​​the mixing pot. The movement trajectory of the mixing components only covers the semi-circular bottom space of the lower part of the mixing pot, resulting in the mixing range being strictly limited to the lower half of the mixing pot. This design means that the mixing pot can hold and effectively mix a small amount of mixture at a time; if the height of the mixing pot is increased to increase the mixing volume per batch, the mixture in the upper area of ​​the mixing pot cannot be effectively mixed by the lower mixing components, which will also create a new "upper mixing dead zone," resulting in significant differences in the mixing uniformity between the upper and lower layers of the mixture, and the mixing efficiency still needs to be further improved. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an asphalt mixture mixing device to solve the technical problems mentioned in the background art. It can expand the mixing coverage area, eliminate "mixing dead zones", and adapt to higher mixing pot heights, thereby increasing the mixing volume of asphalt mixture in a single batch.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] An asphalt mixture mixing device, comprising:

[0009] A support frame is used to support the mixing drum, and a base is provided at the bottom of the support frame;

[0010] The mixing drum has open ends and guide grooves that extend through the bottom of the mixing drum. The bottom of the mixing drum is mounted on a base via support legs. Two sets of racks are symmetrically arranged on both sides of the ends of the mixing drum. One end is also equipped with a guide rail and a slide block slidably connected to the guide rail. A discharge plate is hinged to the lower part of the mixing drum, and a discharge cylinder is hinged to one side of the mixing drum. The piston rod of the discharge cylinder is hinged to the discharge plate.

[0011] The stirring assembly includes a side plate that is intermittently embedded in a guide groove and can move up and down. The length of the side plate is greater than the height of the stirring cylinder. An internal gear ring is provided on the side plate, and a transmission mechanism is located inside the internal gear ring. The transmission mechanism includes a central wheel and several planetary gears that mesh simultaneously with the central wheel and the internal gear ring. A stirring shaft is fixedly connected to both the central wheel and the planetary gears, and stirring blades are provided on the stirring shaft. A motor and a reducer are mounted on the slide block, and the output shaft of the reducer is connected to the stirring shaft. Bosses extending to the outside of the side plate are provided on both sides of the internal gear ring. An inner cover plate is rotatably connected to the boss located inside the stirring cylinder. An outer cover plate is rotatably connected to the boss located outside the stirring cylinder. The stirring shaft is rotatably connected to the inner cover plate, and the stirring shaft on the central wheel is fixedly connected to the outer cover plate. A half-gear is provided on the outer cover plate. During rotation, the half-gear alternately meshes with racks on both sides of the stirring cylinder, thereby driving the entire stirring assembly to reciprocate up and down along the guide rail.

[0012] An asphalt spraying assembly is located on the upper part of the mixing drum and includes an asphalt delivery pipe and several spraying pipes connected thereto.

[0013] Furthermore, the base is provided with a hinge support, the bottom of the support leg is hinged to the hinge support, the outer side of the side plate is provided with a curved groove, and the two sides of the bracket are fixedly connected with levers, which are intermittently disposed in the curved groove.

[0014] Furthermore, one end of the lever is rotatably connected to a rotating wheel.

[0015] Furthermore, the spray pipe is provided in two rows, which are arranged at an angle at the lower part of the asphalt conveying pipe.

[0016] Furthermore, both ends of the spray pipe are fixedly installed on the side plate and rise and fall synchronously with the side plate.

[0017] Furthermore, both the asphalt delivery pipe and the spraying pipe are provided with an insulation layer on the outside.

[0018] Furthermore, the upper part of the asphalt conveying pipe is provided with a protective cover, which is an eaves-type structure.

[0019] Furthermore, a scraper is provided at each end of the mixing drum, with one side of the scraper abutting against the inner surface of the side plate.

[0020] Furthermore, a limiting plate is provided at the lower part of the side plate.

[0021] Furthermore, the stirring blades on the multiple stirring shafts are arranged in an alternating manner, and when the stirring blades rotate to an adjacent stirring shaft, the ends of the stirring blades contact the outer surface of the stirring shaft, which is used to clean the asphalt on the adjacent stirring shaft in real time.

[0022] The beneficial effects of this invention are:

[0023] (1) This invention combines the revolution and rotation of the planetary gear system with the lifting motion driven by the half gear and rack. The stirring shaft and stirring blades not only revolve around the central wheel, but also rotate at high speed on their own. They also reciprocate and lift within the entire height range of the stirring drum, so that the stirring components can cover the area from the bottom to the top of the stirring drum. In particular, it effectively stirs the materials in the upper part of the stirring drum that are difficult to reach by traditional fixed stirrers and existing revolution and rotation equipment, avoiding the problems of stirring dead corners and material segregation, and improving the uniformity of the mixture.

[0024] (2) Because the mixing components have effective lifting capabilities, their mixing range is no longer limited to the lower half of the mixing drum. This allows the equipment to use a larger capacity mixing drum without worrying about the upper and middle parts of the material not being effectively mixed. Therefore, the single-batch output of this device is greatly increased, which can meet the continuous and large-scale supply needs of asphalt mixtures for large-scale projects such as highway construction, and significantly improve production efficiency.

[0025] (3) By movably connecting the mixing drum to the base and setting a lever and a curved groove, when the side plate moves up and down, the lever drives the mixing drum to swing left and right, which enhances the mixing effect of the mixture and improves the mixing efficiency of the mixture.

[0026] (4) Install the spray pipe on the side plate and raise and lower it synchronously with the side plate. When the side plate is raised and lowered, the position of the asphalt sprayed by the spray pipe changes accordingly, which further enhances the uniformity of asphalt spraying and avoids blind spots in asphalt spraying.

[0027] (5) A scraper is installed at each end of the mixing drum to contact the side plate. When the side plate is raised and lowered, the asphalt adhering to the inner surface of the side plate is cleaned. The scraper connects the two sides of the mixing drum, which enhances the strength of the mixing drum.

[0028] (6) The mixing blades on multiple mixing shafts are arranged in an alternating manner, and when the mixing blades rotate to the adjacent mixing shaft, the ends of the mixing blades come into contact with the outer surface of the mixing shaft, which realizes the effect of real-time cleaning of the asphalt adhering to the mixing shaft, ensuring that the surface of the mixing shaft is always relatively clean, ensuring the normal operation of the mixing shaft and the stability of the mixing effect, and greatly improving the reliability and service life of the entire mixing device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an asphalt mixture mixing device according to the present invention.

[0030] Figure 2 This is a schematic diagram of the support structure.

[0031] Figure 3 This is a schematic diagram of the assembly of the mixing drum, mixing components, and asphalt spraying components.

[0032] Figure 4 This is a schematic diagram of the removal of the protective cover from the asphalt spraying assembly.

[0033] Figure 5 This is a schematic diagram of the stirring tank structure.

[0034] Figure 6 This is a schematic diagram of the stirring assembly.

[0035] Figure 7 This is a schematic diagram of the transmission mechanism.

[0036] Figure 8 This is a schematic diagram of the outer cover plate structure.

[0037] In the diagram, 1. Support; 11. Base; 12. Hinge support; 13. Lever; 2. Mixing drum; 21. Discharge plate; 22. Discharge cylinder; 23. Support leg; 24. Guide groove; 25. Scraper; 26. Guide rail; 27. Slide seat; 3. Mixing assembly; 31. Side plate; 32. Internal gear ring; 33. Boss; 34. Center wheel; 35. Planetary gear; 36. Inner cover plate; 37. Mixing shaft; 38. Mixing blade; 39. Outer cover plate; 310. Rack; 311. Curved groove; 312. Reducer; 313. Motor; 314. Limiting plate; 4. Asphalt spraying assembly; 41. Asphalt delivery pipe; 42. Spraying pipe; 43. Protective cover. Detailed Implementation

[0038] The following will be combined with the appendix Figures 1-8 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] like Figure 1 As shown, an asphalt mixture mixing device includes a support frame 1, a mixing drum 2, a mixing assembly 3, and an asphalt spraying assembly 4. Figure 1 , Figure 2 As shown, the bracket 1 is used to support the mixing drum 2, and the lower part of the bracket 1 is provided with a base 11.

[0041] like Figure 5 As shown, the mixing drum 2 is used to hold the mixture. Both ends of the mixing drum 2 are open and equipped with guide grooves 24, which penetrate the bottom of the mixing drum 2. The bottom of the mixing drum 2 is mounted on the base 11 via support legs 23. Two sets of racks 310 are symmetrically arranged on both sides of the ends of the mixing drum 2, and one end is also equipped with a guide rail 26 and a slide block 27 slidably connected to the guide rail 26. Figure 4 As shown, the lower part of the mixing drum 2 is hinged to the discharge plate 21, and the side of the mixing drum 2 is hinged to the discharge cylinder 22. The piston rod of the discharge cylinder 22 is hinged to the discharge plate 21.

[0042] like Figure 3-4 , Figure 6 As shown, the stirring assembly 3 is used to stir the mixture inside the stirring drum 2. It includes a side plate 31 that is intermittently embedded in the guide groove 24 and can move up and down. The length of the side plate 31 is greater than the height of the stirring drum 2. The side plate 31 seals the openings at both ends of the stirring drum 2, preventing leakage of the mixture. Figure 7 As shown, the side plate 31 is provided with an internal gear ring 32, and the internal gear ring 32 is provided with a transmission mechanism. The transmission mechanism includes a central wheel 34 and several planetary gears 35 that mesh with the central wheel 34 and the internal gear ring 32. A stirring shaft 37 is fixedly connected to both the central wheel 34 and the planetary gears 35. The stirring shaft 37 is provided with stirring blades 38. A motor 313 and a reducer 312 are installed on the slide 27. The output shaft of the reducer 312 is connected to the stirring shaft 37. The internal gear ring 32 has protrusions 33 extending to the outside of the side plate 31 on both sides, such as... Figure 6 As shown, an inner cover plate 36 is rotatably connected to the boss 33 located inside the mixing drum 2. The inner cover plate 36 is used to isolate the transmission mechanism and prevent the mixture from entering the interior of the internal gear ring 32; as shown Figure 8As shown, an outer cover plate 39 is rotatably connected to a boss 33 located outside the mixing drum 2. The stirring shaft 37 is rotatably connected to the inner cover plate 36. The stirring shaft on the central wheel is fixedly connected to the outer cover plate 39. A half gear is provided on the outer cover plate 39. During the rotation, the half gear alternately meshes with the racks 310 on both sides of the mixing drum 2, thereby driving the entire stirring assembly 3 to reciprocate up and down along the guide rail 26.

[0043] like Figure 4 As shown, the asphalt spraying assembly 4 is located on the upper part of the mixing drum 2 and is used to spray asphalt onto the aggregate inside the mixing drum 2. It includes an asphalt conveying pipe 41 and several spraying pipes 42 connected thereto.

[0044] like Figure 2 As shown, the base 11 is provided with a hinge support 12, and the bottom of the support leg 23 is hinged to the hinge support 12. The outer side of the side plate 31 is provided with a curved groove 311. The two sides of the bracket 1 are fixedly connected with levers 13, which are intermittently arranged in the curved groove 311. When the side plate 31 moves up and down, due to the cooperation between the levers 13 and the curved groove 311, the special curved trajectory of the curved groove 311 will generate a horizontal component force on the levers 13. Under the action of this component force, the levers 13 drive the mixing drum 2 to swing left and right, which enhances the mixing effect of the mixture and improves the mixing efficiency of the mixture.

[0045] One end of the lever 13 is rotatably connected to a rotating wheel (not shown in the figure). The rotating wheel reduces the friction between the lever 13 and the side wall of the curved groove 311, thereby improving the smoothness of the swing of the stirring drum 2.

[0046] like Figure 4 As shown, the spray pipe 42 has two rows, which are arranged at an angle at the lower part of the asphalt conveying pipe 41, thus expanding the spraying range of the spray pipe 42.

[0047] like Figure 6 As shown, the two ends of the spray pipe 42 are fixedly installed on the side plate 31 and rise and fall synchronously with the side plate 31. When the side plate 31 rises and falls, the position of the asphalt sprayed by the spray pipe 42 changes accordingly. Specifically, since the asphalt falls in a parabolic manner, as the spray pipe 42 rises, the falling point of the asphalt gradually moves away from the asphalt conveying pipe 41, and as the spray pipe falls, the falling point of the asphalt gradually moves closer to the asphalt conveying pipe 41, which further enhances the uniformity of asphalt spraying and avoids blind spots in asphalt spraying.

[0048] Both the asphalt delivery pipe 41 and the spraying pipe 42 are equipped with an insulation layer (not shown in the figure) to prevent the asphalt from solidifying inside the asphalt delivery pipe 41 and the spraying pipe 42.

[0049] like Figure 3As shown, the asphalt conveying pipe 41 is provided with a protective cover 43 on the upper part. The protective cover 43 has an eaves-shaped structure, which not only prevents the aggregate from damaging the asphalt spraying component 4, but also prevents the aggregate from accumulating on the protective cover 43 when it is being discharged.

[0050] like Figure 3 , Figure 5 As shown, each end of the mixing drum 2 is provided with a scraper 25. One side of the scraper 25 abuts against the inner surface of the side plate 31. When the side plate 31 is raised and lowered, it cleans the asphalt adhering to the inner surface of the side plate 31. The scraper 25 connects the plates on both sides of the opening of the mixing drum 2, thereby enhancing the strength of the mixing drum 2.

[0051] like Figure 6 As shown, a limiting plate 314 is provided at the lower part of the side plate 31 to prevent the side plate 31 from detaching from the mixing drum 2 due to excessive stroke.

[0052] like Figure 6 , Figure 7 As shown, the mixing blades 38 on the multiple mixing shafts 37 are arranged in an alternating manner. When the mixing blades 38 rotate to an adjacent mixing shaft 37, the ends of the mixing blades 38 contact the outer surface of the mixing shaft 37. This is used to clean the asphalt on the adjacent mixing shafts 37 in real time, ensuring that the surface of the mixing shaft 37 is always relatively clean. This ensures the normal operation of the mixing shaft 37 and the stability of the mixing effect, and greatly improves the reliability and service life of the entire mixing device.

[0053] When mixing asphalt mixture, preheated aggregate is first added to mixing drum 2, and hot asphalt is introduced into asphalt conveying pipe 41; then motor 313 is started, motor 313 drives central wheel 34 to rotate through reducer 312, central wheel 34 drives planetary wheel 35 to rotate, when central wheel 34 and planetary wheel 35 rotate, they drive mixing shaft 37 and mixing blade 38 on one side to rotate, and mix the mixture. At the same time, planetary wheel 35 revolves around central wheel 34 under the action of internal gear ring 32, which enhances the mixing effect of mixing component 3 and avoids mixing dead corners;

[0054] When the transmission mechanism rotates, it drives the outer cover plate 39 to rotate. Taking the clockwise rotation of the outer cover plate 39 as an example, the outer cover plate 39 drives the half gear clockwise. When the half gear meshes with the rack 310 on the right side, it separates from the rack 310 on the left side. At this time, since the rack 310 is fixedly installed on the mixing drum 2, the half gear drives the entire mixing assembly 3 to move upward along the mixing drum 2. When the half gear meshes with the rack 310 on the left side, it separates from the rack 310 on the right side. The half gear drives the entire mixing assembly 3 to move downward along the mixing drum. The mixing assembly 3 forms a compound motion of rotation, revolution, and lifting within the mixing drum 2. This not only expands the mixing range of the mixing assembly 3 and eliminates dead zones, but also adapts to higher mixing drum heights and increases the mixing volume of asphalt mixture in a single batch. After mixing is completed, the discharge cylinder 22 is controlled to open the discharge plate 21 to discharge the material.

[0055] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the invention, and all such modifications and additions should fall within the protection scope of the present invention.

Claims

1. An asphalt mixture mixing device, characterized in that, include: A support frame is used to support the mixing drum, and a base is provided at the bottom of the support frame; The mixing drum has open ends and guide grooves that extend through the bottom of the mixing drum. The bottom of the mixing drum is mounted on a base via support legs. Two sets of racks are symmetrically arranged on both sides of the ends of the mixing drum. One end is also equipped with a guide rail and a slide block slidably connected to the guide rail. A discharge plate is hinged to the lower part of the mixing drum, and a discharge cylinder is hinged to one side of the mixing drum. The piston rod of the discharge cylinder is hinged to the discharge plate. The stirring assembly includes side plates that are intermittently embedded in guide grooves and can move up and down, with the length of the side plates exceeding the height of the stirring drum. An internal gear ring is provided on the side plates, and a transmission mechanism is located inside the internal gear ring. The transmission mechanism includes a central wheel and several planetary gears that mesh simultaneously with the central wheel and the internal gear ring. A stirring shaft is fixedly connected to both the central wheel and the planetary gears, and stirring blades are provided on the stirring shaft. A motor and a reducer are mounted on a slide, and the output shaft of the reducer is connected to the stirring shaft. Bosses extending beyond the side plates are provided on both sides of the internal gear ring, located inside the stirring drum. An inner cover plate is rotatably connected to the boss; an outer cover plate is rotatably connected to the boss located outside the mixing drum. The mixing shaft is rotatably connected to the inner cover plate, and the mixing shaft on the central wheel is fixedly connected to the outer cover plate. A half gear is provided on the outer cover plate. During rotation, the half gear alternately meshes with the racks on both sides of the mixing drum, thereby driving the entire mixing assembly to reciprocate and lift along the guide rail. A hinge support is provided on the base, and the bottom of the support leg is hinged to the hinge support. A curved groove is provided on the outer side of the side plate. A lever is fixedly connected to both sides of the bracket, and the lever is intermittently set in the curved groove. An asphalt spraying assembly is located on the upper part of the mixing drum and includes an asphalt delivery pipe and several spraying pipes connected thereto.

2. The asphalt mixture mixing device according to claim 1, characterized in that, One end of the lever is rotatably connected to a rotating wheel.

3. The asphalt mixture mixing device according to claim 1, characterized in that, The spray pipes are arranged in two rows at an angle at the bottom of the asphalt conveying pipe.

4. The asphalt mixture mixing device according to claim 3, characterized in that, The two ends of the spray pipe are fixedly installed on the side plate and rise and fall synchronously with the side plate.

5. The asphalt mixture mixing device according to claim 1, characterized in that, Both the asphalt delivery pipe and the spraying pipe are equipped with an external insulation layer.

6. The asphalt mixture mixing device according to claim 1, characterized in that, The asphalt conveying pipe is equipped with a protective cover at the top, and the protective cover has an eaves-type structure.

7. The asphalt mixture mixing device according to claim 1, characterized in that, Each end of the mixing drum is provided with a scraper, and one side of the scraper abuts against the inner surface of the side plate.

8. An asphalt mixture mixing device according to claim 1, characterized in that, A limiting plate is provided at the lower part of the side plate.

9. An asphalt mixture mixing device according to any one of claims 1-8, characterized in that, The mixing blades on the multiple mixing shafts are arranged in an alternating manner, and when the mixing blades rotate to an adjacent mixing shaft, the ends of the mixing blades contact the outer surface of the mixing shaft, which is used to clean the asphalt on the adjacent mixing shaft in real time.

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