An asphalt mixture stirring device and a stirring control method

Abstract

This invention relates to the field of asphalt mixture mixing technology, specifically to an asphalt mixture mixing device and mixing control method. The device includes a support frame and a central support plate. A dual-shaft motor is mounted on the support plate, with a pre-mixing drum and an outer drum arranged above and below. The dual-shaft motor synchronously drives the rotating shafts and propeller blades inside both drums. The outer drum contains a liftable stroke ring, with multiple sets of inner drum segments hinged to the bottom of the stroke ring. A servo motor and screw drive control the inner drum segments to retract for mixing and to expand for unloading. High-temperature resistant sealing strips are installed at the joints of the inner drum segments. This invention uses a single drive system to achieve two-stage mixing, balancing aggregate pre-dispersion and asphalt coating effects. Simultaneously, the expandable inner drum structure achieves residue-free unloading, solving the problems of asphalt sticking to the walls and material residue. The device is compact, reliably sealed, and suitable for continuous mixing of multiple batches of asphalt mixtures.

Description

Technical Field

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

[0002] Asphalt mixture mixing is a core process in road construction and maintenance. The mixing uniformity, unloading cleanliness, and operational stability of the mixing equipment directly determine the quality of the finished mixture and production efficiency.

[0003] Existing asphalt mixing plants mostly adopt a single fixed cylinder structure, which has the following drawbacks in practical use: First, a single mixing process cannot meet the differentiated process requirements of aggregate pre-dispersion and asphalt coating, resulting in insufficient mixing uniformity and a tendency to produce white aggregate. Second, some double-drum mixing equipment uses two independent drive systems, which are redundant in structure, have high equipment costs and energy consumption, and have complicated material transfer connections.

[0004] Secondly, the fixed cylinders mostly use bottom-opening side-opening unloading doors. High-temperature asphalt has strong adhesion and is prone to leaving coke residues on the cylinder walls and corners. This not only makes cleaning and maintenance difficult and the maintenance cycle short, but also affects the proportioning accuracy and quality stability of the next batch of mixture.

[0005] Third, existing openable unloading barrels generally have poor sealing performance. Under high-temperature conditions, the seals are prone to aging and failure, resulting in asphalt leakage. In addition, the opening and closing drive mechanism has a complex structure and insufficient operational stability.

[0006] To address the shortcomings of the existing technology, this invention proposes an asphalt mixture mixing device and a mixing control method to solve the problems of poor mixing uniformity, excessive discharge residue, and insufficient sealing performance of existing equipment. Summary of the Invention

[0007] To address the problems in the prior art, the present invention provides an asphalt mixture mixing device and a mixing control method.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: an asphalt mixture mixing device, including a support frame, a support plate fixedly connected to the central side wall of the support frame, a dual-shaft motor fixedly installed on the top of the support plate, a pre-mixing drum fixedly installed on the side wall of the support frame above the dual-shaft motor, a cover plate installed on the top of the pre-mixing drum, and a first feed pipe fixedly connected to the top of the cover plate; an outer barrel fixedly connected to the bottom of the support plate, a second feed pipe fixedly connected to the top of the support plate corresponding to the position of the outer barrel, the second feed pipe communicating with the interior of the outer barrel, a guide pipe fixedly connected to the top of the outer barrel away from the second feed pipe, the other end of the guide pipe passing through the support plate and fixedly communicating with the pre-mixing drum; a fixing plate fixedly connected to the outer wall of the pre-mixing drum, and a servo motor fixedly installed on the top of the fixing plate. The output end of the servo motor moves through the support plate and is fixedly connected to a lead screw via a coupling. An internal thread block is threaded onto the wall of the lead screw, and a matching groove is formed on the outer wall of the outer barrel corresponding to the internal thread block. A stroke ring is fixedly connected to one end of the internal thread block extending through the groove into the interior of the outer barrel. The stroke ring is slidably connected inside the outer barrel, and several hinge frames are fixedly connected at equal intervals at the bottom of the stroke ring. Each hinge frame is hinged to a hinge block via a pin. An inner barrel segment is fixedly connected to the bottom of the hinge block, and a sealing groove is formed at the joint of two adjacent inner barrel segments, with a sealing strip embedded inside the sealing groove. The two output ends of the dual-shaft motor extend into the interior of the pre-mixing tank and the outer barrel, respectively, and are fixedly connected to rotating shafts via couplings. Propeller blades are provided on the shaft walls inside both the pre-mixing tank and the outer barrel.

[0009] Specifically, the sealing strip is a carbon fiber filled PTFE seal.

[0010] Specifically, a base is fixedly connected to the bottom of the support frame.

[0011] Specifically, the inner barrel is provided in four sets, and the four sets of inner barrels constitute a complete barrel body.

[0012] Specifically, each inner barrel segment has a material collecting slant block fixedly connected to its inner bottom.

[0013] Specifically, each inner barrel segment has a stroke slider fixedly connected to its outer barrel wall, and the inner wall of the outer barrel has a corresponding stroke groove.

[0014] A method for controlling the mixing of asphalt mixtures, the method being implemented using the aforementioned mixing device, includes the following steps: S1 Initial Reset: Control the servo motor to drive the lead screw to rotate, causing the stroke ring to move upward along the inner wall of the outer barrel, pulling all the inner barrel segments into the outer barrel and forming a sealed inner mixing barrel, thus completing the initial state reset; S Premixing Operation: Aggregates and mineral powder are fed into the premixing drum through the first feed pipe. The dual-shaft motor is started to drive the upper rotating shaft and propeller blades to rotate, pre-dispersing and mixing the materials. After premixing is completed, the materials are automatically fed into the lower inner mixing drum through the guide pipe. S Main mixing operation: Hot asphalt and admixtures are fed into the inner mixing tank through the second feed pipe. The dual-shaft motor synchronously drives the lower rotating shaft and propeller blades to rotate, forcibly mixing the mixture until the asphalt evenly coats the surface of the aggregate. S-unloading operation: After mixing is completed, the servo motor is started to drive the lead screw to rotate in the opposite direction, which drives the stroke ring to move downward and pushes the inner barrel flap downward to extend out of the outer barrel body; after the inner barrel flap loses the radial constraint of the outer barrel body, it unfolds outward along the hinge, and the internal asphalt mixture falls by its own weight to complete the unloading. S-cycle reset: After unloading is completed, the servo motor drives the stroke ring to move upward, and the inner barrel flaps re-close and seal under the constraint of the inner wall of the outer barrel, and enter the next batch mixing cycle.

[0015] Specifically, in step S2, the premixing time is set to 15~30s. Only solid materials are added during the premixing stage to break up aggregate agglomerates and homogenize the material temperature.

[0016] Specifically, in step S4, the downward stroke and unfolding angle of the inner barrel flap are precisely controlled by the number of rotations of the servo motor; when the inner barrel flap closes, the inner wall of the outer barrel radially squeezes the inner barrel flap, causing the sealing strip to deform under pressure and fill the splicing gap, thereby achieving barrel sealing.

[0017] The beneficial effects of this invention are: (1) The dual-shaft motor synchronously drives the upper and lower two-stage mixing structure, and one drive system completes the pre-mixing and main mixing processes simultaneously. The aggregate is first dispersed and homogenized and its temperature is balanced in the pre-mixing drum, and then it enters the inner mixing drum to be fully coated with asphalt. This not only effectively improves the uniformity of the mixture and avoids the generation of white material, but also simplifies the transmission system structure and reduces the equipment manufacturing cost and operating energy consumption. The two drums are connected by the material guide pipe and rely on their own weight to transfer the material, without the need for an additional material transfer mechanism, resulting in higher production efficiency.

[0018] (2) The multi-lobed expandable inner mixing tank structure is adopted. The folding and unfolding of the inner tank lobes can be controlled by a servo motor and screw drive. During the mixing state, the inner tank lobes are radially constrained by the inner wall of the outer tank, maintaining a sealed cylindrical shape. When unloading, the inner tank lobes extend outward from the outer tank and automatically unfold, and the tank is completely open. The material falls completely by its own weight, which fundamentally solves the industry problem of material residue and asphalt sticking to the wall and coking in traditional fixed tanks. It eliminates the need for frequent manual cleaning and greatly extends the equipment maintenance cycle.

[0019] (3) The inner barrel segment joint is made of carbon fiber filled PTFE sealing strip, which has the characteristics of high temperature resistance, wear resistance and self-lubrication, and is suitable for the high temperature working conditions of asphalt mixing; when closed, the sealing strip is tightly fitted by the radial compression of the outer barrel body, which effectively prevents high temperature asphalt from leaking from the joint gap. With the guide and limit structure of stroke slider and stroke groove, the inner barrel segment lifting and opening and closing process is stable and without deviation, and the sealing performance is durable and reliable.

[0020] (4) An inclined block for material collection is set at the bottom of the inner barrel. During the mixing process, it can guide the material to converge towards the central mixing area, thereby enhancing the shearing and mixing effect. When the material is unloaded, it can guide the material to slide down quickly, further reducing the material residue at the bottom of the barrel. The overall device has a compact layout and simple control logic, which can realize continuous cycle operation. It is suitable for the precise mixing of small and medium batches of asphalt mixtures, and is especially suitable for road maintenance site mixing scenarios. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of an asphalt mixture mixing device provided by the present invention; Figure 2 This is a front view of an asphalt mixture mixing device provided by the present invention; Figure 3 This is an exploded view of an asphalt mixture mixing device provided by the present invention; Figure 4 This is a schematic diagram of the structure of the inner barrel flap in an asphalt mixture mixing device provided by the present invention; Figure 5 This is a schematic diagram of the stroke ring in an asphalt mixture mixing device provided by the present invention; Figure 6 The flowchart illustrates a method for controlling the mixing of asphalt mixtures provided by this invention.

[0023] In the diagram: 1. Support frame; 2. Support plate; 3. Base; 4. Dual-shaft motor; 5. Premixing tank; 6. Cover plate; 7. First feed pipe; 8. Outer tank body; 9. Second feed pipe; 10. Guide pipe; 11. Fixing plate; 12. Servo motor; 13. Lead screw; 14. Stroke ring; 15. Hinge frame; 16. Hinge block; 17. Inner tank flap; 18. Sealing groove; 19. Sealing strip; 20. Collecting inclined block; 21. Stroke slider; 22. Rotating shaft; 23. Propeller blade. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] like Figures 1-5As shown, the asphalt mixture mixing device of the present invention includes a support frame 1, which is a vertical frame structure. A horizontally arranged support plate 2 is fixedly connected to the central side wall of the support frame 1, dividing the support frame 1 into upper and lower installation chambers. A dual-shaft motor 4 is fixedly installed at the top center of the support plate 2. The dual-shaft motor 4 has an upper and lower dual-output shaft structure, with the two output shafts arranged coaxially and extending towards the interior of the premixing tank 5 and the outer tank body 8, respectively. A base 3 is fixedly connected to the bottom of the support frame 1. The base 3 increases the support contact area and improves the overall stability of the equipment operation.

[0026] A premixing tank 5 is fixedly installed on the side wall of the support frame 1 above the dual-shaft motor 4. The premixing tank 5 is a vertical cylindrical structure with the opening facing upwards. A cover plate 6 is detachably installed on the top of the premixing tank 5. A first feed pipe 7 is fixedly connected to the top of the cover plate 6. The first feed pipe 7 is used to feed in solid mixing materials such as aggregates and mineral powder.

[0027] An outer barrel 8 is fixedly connected to the bottom center of the support plate 2. The outer barrel 8 is a vertical cylindrical structure with an open bottom and is coaxially arranged with the premixing tank 5. A second feed pipe 9 is fixedly connected to the top of the support plate 2, corresponding to the position inside the outer barrel 8. The second feed pipe 9 vertically penetrates the support plate 2, and its lower end communicates with the inside of the outer barrel 8, for feeding hot asphalt, admixtures, and other materials. A guide pipe 10 is fixedly connected to the top of the outer barrel 8 on the side away from the second feed pipe 9. The other end of the guide pipe 10 passes upward through the support plate 2 and is fixedly connected to the bottom side wall of the premixing tank 5. The premixed material can fall into the outer barrel 8 below by its own weight through the guide pipe 10.

[0028] A horizontally extending fixing plate 11 is fixedly connected to one side of the outer wall of the premixing tank 5. A servo motor 12 is fixedly installed on the top of the fixing plate 11. The output end of the servo motor 12 is vertically downward and passes through the support plate 2. It is then fixedly connected to a lead screw 13 via a coupling. The lead screw 13 is arranged parallel to the axial direction of the outer tank body 8. An internal threaded block is threaded onto the wall of the lead screw 13. A strip-shaped groove extending axially is provided on the outer wall of the outer tank body 8 corresponding to the position of the internal threaded block. The internal threaded block passes through the groove and extends to one end inside the outer tank body 8, where a stroke ring 14 is fixedly connected. The stroke ring 14 has a circular ring structure, and its outer wall slides in contact with the inner wall of the outer tank body 8. When the servo motor 12 drives the lead screw 13 to rotate, the stroke ring 14 can slide up and down along the inner wall of the outer tank body 8 through threaded transmission.

[0029] On the bottom end face of the stroke ring 14, several hinge frames 15 are fixedly connected at equal intervals along the circumference. Each hinge frame 15 is hinged to a hinge block 16 via a horizontal pin. The hinge block 16 can swing outward radially around the pin. The bottom of the hinge block 16 is fixedly connected to an inner barrel petal 17, which is an arc-shaped vertical plate structure. In this embodiment, four sets of inner barrel petals 17 are provided. After the four sets of inner barrel petals 17 are gathered inward, they can be spliced ​​to form a complete cylindrical inner mixing barrel, which is coaxially arranged with the outer barrel 8.

[0030] On the splicing end faces of two adjacent inner barrel segments 17, there are axially continuous sealing grooves 18, and sealing strips 19 are embedded inside the sealing grooves 18. When the inner barrel segments 17 are closed, the end faces of adjacent inner barrel segments 17 fit together, and the sealing strips 19 are compressed to fill the splicing gaps, achieving axial sealing of the inner mixing barrel. In this embodiment, the sealing strip 19 is a carbon fiber filled PTFE seal, which has excellent high temperature resistance, wear resistance and self-lubricating properties, can adapt to the high temperature conditions of asphalt mixing for a long time, and is not prone to aging and failure.

[0031] Each inner drum segment 17 has a fixedly connected material collecting inclined block 20 at its inner bottom. The material collecting inclined block 20 has a wedge-shaped structure and slopes downward toward the center of the inner mixing drum. During mixing, the material collecting inclined block 20 can guide the material to converge toward the central mixing area, enhancing the mixing effect; during unloading, the inclined surface of the material collecting inclined block 20 can guide the material to slide down quickly, reducing residue at the bottom of the drum.

[0032] Each inner tub segment 17 is fixedly connected to a stroke slider 21 on its outer tub wall. Corresponding to the position of the stroke slider 21, an axially extending stroke groove is formed on the inner wall of the outer tub body 8. The stroke slider 21 is embedded in the stroke groove and can slide along it. The stroke slider 21, in cooperation with the stroke groove, guides and circumferentially limits the lifting and lowering of the inner tub segment 17, ensuring that the inner tub segment 17 does not shift circumferentially during lifting and lowering, thus improving operational stability and sealing performance.

[0033] The upper and lower output ends of the dual-shaft motor 4 extend to the center of the pre-mixing tank 5 and the outer tank 8, respectively, and both output ends are fixedly connected to rotating shafts 22 via couplings. The two rotating shafts 22 are coaxially arranged with the pre-mixing tank 5 and the inner mixing tank in its collapsed state, respectively. Propeller blades 23 are fixedly installed on the shaft walls inside the pre-mixing tank 5 and the outer tank 8. When the dual-shaft motor 4 starts, it synchronously drives the two rotating shafts 22 and the propeller blades 23 to rotate, completing the pre-mixing and main mixing processes respectively.

[0034] like Figure 6 As shown, the asphalt mixture mixing control method of the present invention is implemented based on the above-mentioned mixing device, and the specific working process is as follows: S1 Initial Reset: After the equipment is started, the control system sends a reset command to the servo motor 12. The servo motor 12 drives the lead screw 13 to rotate in the forward direction, which drives the stroke ring 14 to move upward along the inner wall of the outer barrel 8 through the internal thread block. The stroke ring 14 pulls the four sets of inner barrel segments 17 to rise synchronously. During the rise, the inner barrel segments 17 are radially squeezed by the inner wall of the outer barrel 8 and retract inward around the hinge. Finally, they are completely housed inside the outer barrel 8 and spliced ​​to form a sealed cylindrical inner mixing barrel, completing the initial reset and waiting for feeding.

[0035] S2 Premixing Operation: The metered and proportioned aggregates, mineral powder, and other solid materials are fed into the premixing drum 5 through the first feed pipe 7; the dual-shaft motor 4 is started, driving the upper rotating shaft 22 and the propeller blades 23 to rotate, pre-dispersing and mixing the solid materials, breaking up agglomerated aggregates, and homogenizing the material temperature. In this embodiment, the premixing time is set to 20 seconds, which can be adjusted within the range of 15 to 30 seconds according to the aggregate particle size and batch quantity. After premixing is completed, the material is automatically pushed into the inner mixing drum below by the propeller blades 23 and its own weight through the guide pipe 10.

[0036] S3 Main Mixing Operation: Metered hot asphalt and admixtures are added to the inner mixing drum through the second feed pipe 9; the dual-shaft motor 4 runs continuously, synchronously driving the lower rotating shaft 22 and propeller blades 23 to rotate, forcibly mixing the mixture in the inner mixing drum, so that the asphalt evenly coats the surface of all aggregates. In this embodiment, the main mixing time is set to 45 seconds, which can be adjusted in the range of 30 to 60 seconds according to the type of mixture to ensure uniform mixing without any white spots.

[0037] S4 Unloading Operation: After mixing is completed, the dual-shaft motor 4 stops running; the control system starts the servo motor 12 to rotate in the reverse direction, driving the stroke ring 14 downward along the inner wall of the outer barrel 8 through the lead screw 13, pushing the inner barrel flap 17 downward to extend out of the outer barrel 8. As the inner barrel flap 17 gradually extends, after losing the radial constraint of the inner wall of the outer barrel 8, the inner barrel flap 17 unfolds outward around the pin axis of the hinge frame 15 under the action of the material's gravity and its own gravity, and the bottom of the barrel is completely open. The asphalt mixture inside falls automatically by its own weight, completing the unloading. In this step, the servo motor 12 precisely controls the downward stroke and unfolding angle of the inner barrel flap 17 by controlling the number of rotations, ensuring thorough unloading without residue.

[0038] S5 Reset Cycle: After unloading, the servo motor 12 rotates forward again, driving the stroke ring 14 upward; as the inner barrel segment 17 rises with the stroke ring 14, its outer wall contacts the inner wall of the lower opening of the outer barrel body 8, and after being subjected to radial extrusion force, it retracts inward, the splicing surfaces of adjacent inner barrel segments 17 fit together, the sealing strip 19 is deformed under pressure to fill the gap, and a sealed inner mixing barrel is formed again; then the next batch of feeding and mixing cycle can begin.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An asphalt mixture mixing device, characterized in that, Includes a support frame (1), a support plate (2) is fixedly connected to the central side wall of the support frame (1), a dual-shaft motor (4) is fixedly installed on the top of the support plate (2), a pre-mixing tank (5) is fixedly installed on the side wall of the support frame (1) above the dual-shaft motor (4), a cover plate (6) is installed on the top of the pre-mixing tank (5), and a first feed pipe (7) is fixedly connected to the top of the cover plate (6). The bottom of the support plate (2) is fixedly connected to the outer barrel (8), and the top of the support plate (2) is fixedly connected to the position of the outer barrel (8). The second feed pipe (9) is connected to the interior of the outer barrel (8). The top of the outer barrel (8) away from the second feed pipe (9) is fixedly connected to the guide pipe (10). The other end of the guide pipe (10) passes through the support plate (2) and is fixedly connected to the premixing barrel (5). A fixing plate (11) is fixedly connected to the outer wall of the premixing barrel (5). A servo motor (12) is fixedly installed on the top of the fixing plate (11). The output end of the servo motor (12) moves through the support plate (2) and is fixedly connected to a lead screw (13) through a coupling. An internal thread block is threaded on the rod wall of the lead screw (13), and a matching groove is opened on the outer wall of the outer barrel (8) corresponding to the internal thread block. A stroke ring (14) is fixedly connected to one end of the internal thread block that extends through the groove into the interior of the outer barrel (8). The stroke ring (14) is slidably connected inside the outer barrel (8), and several hinge frames (15) are fixedly connected at equal intervals at the bottom of the stroke ring (14). Each hinge frame (15) is hinged to a hinge block (16) by a pin. The bottom of the hinge block (16) is fixedly connected to an inner barrel piece (17). A sealing groove (18) is provided at the splice of two adjacent inner barrel pieces (17), and a sealing strip (19) is embedded inside the sealing groove (18). The two output ends of the dual-shaft motor (4) extend into the interior of the premixing tank (5) and the outer tank (8), respectively, and are fixedly connected to the rotating shaft (22) by a coupling. The rotating shaft (22) is provided with propeller blades (23) on the shaft wall inside the premixing tank (5) and the outer tank (8).

2. The asphalt mixture mixing device according to claim 1, characterized in that: The sealing strip (19) is a carbon fiber filled PTFE seal.

3. The asphalt mixture mixing device according to claim 1, characterized in that: The bottom of the support frame (1) is fixedly connected to the base (3).

4. The asphalt mixture mixing device according to claim 1, characterized in that: The inner barrel petals (17) are provided in four sets, and the four sets of inner barrel petals (17) constitute a complete barrel body.

5. The asphalt mixture mixing device according to claim 1, characterized in that: Each inner barrel segment (17) has a material collecting inclined block (20) fixedly connected to its inner bottom.

6. The asphalt mixture mixing device according to claim 1, characterized in that: Each inner barrel segment (17) has a stroke slider (21) fixedly connected to its outer barrel wall, and the inner wall of the outer barrel body (8) has a corresponding stroke groove for the stroke slider (21).

7. A method for controlling the mixing of asphalt mixtures, wherein the method is implemented using the mixing device according to any one of claims 1-6, characterized in that, Includes the following steps: S1 Initial Reset: Control the servo motor (12) to drive the lead screw (13) to rotate, drive the stroke ring (14) to move up along the inner wall of the outer barrel (8), pull all the inner barrel petals (17) to be stored inside the outer barrel (8) and close up to form a sealed inner mixing barrel, thus completing the initial state reset; S2 Premixing Operation: Aggregates and mineral powder are fed into the premixing drum (5) through the first feed pipe (7). The dual-shaft motor (4) is started to drive the upper rotating shaft (22) and the propeller blade (23) to rotate, and the materials are pre-dispersed and mixed. After the premixing is completed, the materials are automatically fed into the lower inner mixing drum through the guide pipe (10). S3 Main mixing operation: Hot asphalt and admixtures are fed into the inner mixing tank through the second feed pipe (9). The dual-shaft motor (4) synchronously drives the lower rotating shaft (22) and the propeller blade (23) to rotate, forcibly mixing the mixture until the asphalt evenly coats the surface of the aggregate. S4 Unloading Operation: After mixing is completed, start the servo motor (12) to drive the screw (13) to rotate in the opposite direction, drive the stroke ring (14) to move downward, and push the inner barrel petal (17) to extend downward out of the outer barrel body (8); after the inner barrel petal (17) loses the radial constraint of the outer barrel body (8), it unfolds outward along the hinge, and the internal asphalt mixture relies on its own weight to fall and complete the unloading. S5 Cycle Reset: After unloading, the servo motor (12) drives the stroke ring (14) to move upward, and the inner barrel flap (17) re-closes and seals under the constraint of the inner wall of the outer barrel (8), and enters the next batch mixing cycle.

8. The method for controlling the mixing of asphalt mixtures according to claim 7, characterized in that: In step S2, the premixing time is set to 15~30s. Only solid materials are added during the premixing stage to break up aggregate agglomerates and homogenize the material temperature.

9. The method for controlling the mixing of asphalt mixtures according to claim 7, characterized in that: In step S4, the downward stroke and unfolding angle of the inner barrel flap (17) are precisely controlled by the number of rotations of the servo motor (12); when the inner barrel flap (17) closes, the inner wall of the outer barrel body (8) radially squeezes the inner barrel flap (17), causing the sealing strip (19) to be deformed under pressure and fill the splicing gap, thereby achieving barrel sealing.

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