Asphalt mixture gyratory compactor

Abstract

The present application provides a kind of asphalt mixture gyratory compactor, including base, pressure head, test mould and push mechanism, base includes pedestal, support frame and lower pressing mechanism, lower pressing mechanism is installed on support frame, and pedestal is set corresponding below lower pressing mechanism;Pressure head is connected with lower pressing mechanism by thick connector, so that the extension axis of pressure head and the pressing direction of lower pressing mechanism have included angle A;Test mould is installed on pedestal, and can rotate relative to pedestal, and test mould is filled with asphalt mixture;Push mechanism is installed on support frame, and can push test mould to overturn relative to pedestal along horizontal direction, and make pressure head enter test mould and press asphalt mixture when descending.The pressure of lower pressing mechanism is decomposed into the pressure of pressure head pressing asphalt mixture and the lateral shear force of pressure head to asphalt mixture two resultant forces, so that asphalt mixture is compacted while bearing lateral shear force, so that lateral shear force can be simulated during compaction.

Description

Technical Field

[0001] This invention generally relates to the technical field of asphalt mixture compaction, and more specifically, to a device capable of simulating lateral shear force during the compaction process. Background Technology

[0002] Currently, most mainstream rotary compactors have a fixed internal rotation angle, and all are manually adjustable. Measuring the internal rotation angle requires a dedicated angle calibrator. This is not only very cumbersome to operate, but also results in low accuracy.

[0003] Simulating lateral shear force during asphalt mixture compaction aims to reproduce the actual stress, improve compaction quality, optimize design and construction, and prevent defects. These are key requirements for both indoor testing and on-site management.

[0004] In actual compaction, the roller generates vertical pressure plus horizontal shear / kneading, subjecting the mixture to triaxial stress (vertical + lateral confining pressure + shear), rather than simple uniaxial compression. Especially when turning / changing lanes / climbing slopes, oblique / lateral shear is generated, making it prone to pushing, shoving, and slippage. Without simulating lateral shear, the density, structure, and strength of specimens / on-site deviate significantly from reality, resulting in design and construction distortions.

[0005] Shear action promotes aggregate interlocking, asphalt film migration, and void removal, making it easier to achieve the target density than simple static compaction. Simulated lateral shear can optimize compaction parameters (speed, number of passes, temperature, roller type) and reduce under-compaction / over-compaction, segregation, and shoving.

[0006] This simulation yields shear strength, cohesion, internal friction angle, and shear modulus, providing a more accurate representation of pavement performance than Marshall stability. It evaluates high-temperature resistance to rutting, shear deformation, and shoving, supporting mix design and material selection. It helps prevent early pavement distress: insufficient shear leads to low density, large voids, water loss, loosening, and rutting; excessive shear leads to aggregate breakage and structural damage. The simulation can predict shoving, swelling, and shear cracking in advance, optimizing construction techniques.

[0007] Therefore, how to simulate the generation of lateral shear force during the compaction process is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] A primary objective of this invention is to overcome at least one of the deficiencies of the prior art and to provide a rotary compactor for asphalt mixtures that can simulate lateral shear forces during the compaction process.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0010] According to one aspect of the present invention, a rotary compactor for asphalt mixtures is provided, comprising:

[0011] The base includes a base, a support frame, and a pressing mechanism. The pressing mechanism is mounted on the support frame, and the base is disposed below the pressing mechanism.

[0012] The pressure head is connected to the pressing mechanism via a thicker connecting body, such that there is an angle A between the extension axis of the pressure head and the pressing direction of the pressing mechanism.

[0013] A trial mold is mounted on the base and is rotatable relative to the base; the trial mold is filled with asphalt mixture.

[0014] A pushing mechanism is installed on the support frame and is capable of pushing the mold in the horizontal direction to flip relative to the base, and causing the pressure head to enter the mold and press against the asphalt mixture when it descends;

[0015] After the pushing mechanism pushes the test mold into place, the pressing mechanism drives the pressing head to press down. The pressing head enters the test mold and presses against the asphalt mixture. The pressure of the pressing mechanism is decomposed into two forces: the pressure of the pressing head pressing against the asphalt mixture and the lateral shear force of the pressing head on the asphalt mixture. This allows the asphalt mixture to withstand lateral shear force while being compacted, thus realistically simulating the actual stress situation of asphalt pavement.

[0016] According to one embodiment of the present invention, the pressing mechanism includes a driver, a fine-tuning structure, a guide rail, and a reaction frame. The driver and the fine-tuning structure are mounted on the support frame. The guide rail is connected to the fine-tuning structure. The reaction frame is mounted below the fine-tuning structure. The driver drives the reaction frame to move up and down along the guide rail. The thicker connecting body is connected below the reaction frame.

[0017] According to one embodiment of the present invention, the fine-tuning structure includes an arc-shaped protrusion and a rotating plate. The arc-shaped protrusion is fixedly mounted on the support frame. An arc-shaped groove is provided on the rotating plate, which engages with the arc-shaped protrusion. The rotating plate is elastically connected to the support frame and has a rotational clearance. The reaction frame is connected below the rotating plate.

[0018] According to one embodiment of the present invention, the thicker connecting body is sleeved on the power output end of the reaction frame, the cross-section of the thicker connecting body is a wedge-shaped structure, the cross-section of the pressure head is a T-shaped structure, and the pressure head is fixedly disposed below the thicker connecting body by a connecting member.

[0019] According to one embodiment of the present invention, the test mold is a cylindrical structure, including a side wall and a bottom plate, the side wall protruding from the bottom plate, the base including a circular protrusion, the circular protrusion being fastened between the side wall and the bottom plate, and the circular protrusion having a flipping gap with the side wall.

[0020] According to one embodiment of the present invention, the pushing mechanism includes a pushing frame, a driving member, a wedge, and a fork. The pushing frame is mounted on the support frame, and the driving member, the wedge, and the fork are mounted on the pushing frame. The driving member drives the wedge to move along a first direction on the pushing frame. The side of the wedge abuts against the fork and can drive the fork to move along a second direction on the pushing frame. The first direction and the second direction are perpendicular, and the fork engages with the test mold.

[0021] According to one embodiment of the present invention, the output end of the fork head that engages with the test mold has an arc-shaped groove, and two rotating rings are symmetrically arranged in the arc-shaped groove, with the tops of the two rotating rings abutting against the side wall.

[0022] According to one embodiment of the present invention, the angle A is 0° to 1.4°, the pushing mechanism pushes the mold into place before the pressure head presses down, and continuously presses against the outer edge of the mold during the process of the pressure head entering the mold and pressing against the asphalt mixture, and the pushing mechanism retracts after the pressure head exits the mold.

[0023] According to one embodiment of the present invention, the asphalt mixture rotary compactor further includes an automatic control system, which is communicatively connected to the pressing mechanism and the pushing mechanism, and controls the operation of the pressing mechanism and the pushing mechanism.

[0024] According to one embodiment of the present invention, the automatic control system is communicatively connected to two pressure sensors. One of the pressure sensors is disposed between the pressure head and the reaction frame to detect the vertical pressure between the pressure head and the asphalt mixture. The other pressure sensor is installed below the pushing mechanism to detect the horizontal pressure between the mold and the pushing mechanism.

[0025] As can be seen from the above technical solution, the advantages and positive effects of the asphalt mixture rotary compactor of the present invention are as follows:

[0026] In this invention, the extension axis of the pressure head has an angle A with the pressing direction of the pressing mechanism. The pressure of the pressing mechanism is decomposed into two results: the pressure of the pressure head pressing against the asphalt mixture and the lateral shear force of the pressure head on the asphalt mixture. This allows the asphalt mixture to bear the lateral shear force while being compacted, thereby simulating the generation of lateral shear force during the compaction process. Attached Figure Description

[0027] Various objects, features, and advantages of the invention will become more apparent from the following detailed description of preferred embodiments of the invention, taken in conjunction with the accompanying drawings. The drawings are merely illustrative of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0028] Figure 1 This is a schematic diagram of the structure of the rotary compactor for asphalt mixtures of the present invention, shown in an exemplary embodiment.

[0029] Figure 2 This is a schematic diagram illustrating the decomposition of the pressure head of the rotary compactor for asphalt mixtures of the present invention, shown in an exemplary embodiment.

[0030] Figure 3 This is a schematic diagram of the fine-tuning structure of the rotary compactor for asphalt mixtures of the present invention, shown in an exemplary embodiment.

[0031] Figure 4 This is a schematic diagram of the structure of the circular protrusion plate of the rotary compactor for asphalt mixtures of the present invention in conjunction with a test mold, as shown in an exemplary embodiment.

[0032] Figure 5 This is a three-dimensional structural schematic diagram of the pushing mechanism of the rotary compactor for asphalt mixtures of the present invention, shown in an exemplary embodiment.

[0033] Figure 6 This is a schematic diagram of the pushing mechanism of the rotary compactor for asphalt mixtures of the present invention from another perspective, shown in an exemplary embodiment.

[0034] Drawing number explanation:

[0035] 1. Matrix;

[0036] 11. Base;

[0037] 111. Circular protrusion;

[0038] 12. Support frame;

[0039] 13. Pressing mechanism;

[0040] 131. Driver;

[0041] 132. Fine-tuning the structure;

[0042] 1321. Arc-shaped protrusion;

[0043] 1322, Transfer board;

[0044] 133. Guide rail;

[0045] 134. Reaction frame;

[0046] 2. Pressure head;

[0047] 21. Thicker connector;

[0048] 3. Trial molding;

[0049] 31. Base plate;

[0050] 32. Side wall;

[0051] 4. Recommended by relevant organizations;

[0052] 41. Push-back frame;

[0053] 42. Driving components;

[0054] 43. Wedge block;

[0055] 44. Fork head;

[0056] 441. Arc-shaped groove;

[0057] 442. Rotate in a circle. Detailed Implementation

[0058] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0059] In the following description of various examples of the invention, reference is made to the accompanying drawings, which form part of the invention, and in which different exemplary structures, systems, and steps that can implement various aspects of the invention are shown by way of example. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the invention. Furthermore, while the terms “top,” “bottom,” “front,” “rear,” “side,” etc., may be used in this specification to describe various exemplary features and elements of the invention, these terms are used herein only for convenience, such as the orientation according to the examples shown in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the invention.

[0060] like Figures 1 to 6 As shown, an asphalt mixture rotary compactor of the present invention includes a base 1, a compactor head 2, a test mold 3, and a pushing mechanism 4. The base 1 includes a base 11, a support frame 12, and a pressing mechanism 13. The pressing mechanism 11 is mounted on the support frame 12, and the base 11 is positioned below the pressing mechanism 13.

[0061] The pressure head 2 is connected to the pressing mechanism 13 via a thicker connecting body 21, such that the extension axis of the pressure head 2 forms an angle A with the pressing direction of the pressing mechanism. The test mold 3 is mounted on the base 11 and can rotate relative to the base 11. Asphalt mixture is filled into the test mold 3. The pushing mechanism 4 is mounted on the support frame 12 and can push the test mold 3 to rotate relative to the base 11 in the horizontal direction, so that the pressure head 2 enters the test mold 3 to press against the asphalt mixture when it descends.

[0062] After the pushing mechanism 4 pushes the test mold 3 into place, the pressing mechanism 13 drives the pressing head 2 to press down. The pressing head 2 enters the test mold 3 and presses against the asphalt mixture. The pressure F of the pressing mechanism 13 is decomposed into two combined forces: the pressure F1 of the pressing head 2 pressing against the asphalt mixture and the lateral shear force F2 of the pressing head 2 on the asphalt mixture. This allows the asphalt mixture to withstand the lateral shear force F2 while being compacted, thus realistically simulating the actual stress situation of the asphalt pavement.

[0063] According to one embodiment of the present invention, the pressing mechanism 13 includes a driver 131, a fine-tuning structure 132, a guide rail 133, and a reaction frame 134. The driver 131 and the fine-tuning structure 132 are mounted on the support frame 12, the guide rail 133 connects to the fine-tuning structure 132, the reaction frame 134 is mounted below the fine-tuning structure 132, the driver 131 drives the reaction frame 134 to move up and down along the guide rail 133, and the thicker connecting body 21 is connected below the reaction frame 134.

[0064] According to one embodiment of the present invention, the fine-tuning structure 132 includes an arc-shaped protrusion 1321 and a rotating plate 1322. The arc-shaped protrusion 1321 is fixedly mounted on the support frame 12. The rotating plate 1322 has an arc-shaped groove that engages with the arc-shaped protrusion 1321. The rotating plate 1322 is elastically connected to the support frame 12 and has a rotational clearance. The reaction frame 134 is connected below the rotating plate 1322. A spring connection can be provided between the rotating plate 1322 and the support frame 12.

[0065] According to one embodiment of the present invention, the thicker connecting body 21 is sleeved on the power output end of the reaction frame 134, the cross section of the thicker connecting body 21 is a wedge-shaped structure, the cross section of the pressure head 2 is a T-shaped structure, and the pressure head 2 is fixedly disposed below the thicker connecting body 21 by a connecting member.

[0066] According to one embodiment of the present invention, the test mold 3 is a cylindrical structure, including a side wall 32 and a bottom plate 31. The side wall 32 protrudes from the bottom plate 31, and the base 11 includes a circular protrusion 111. The circular protrusion 111 is fastened between the side wall 32 and the bottom plate 31, and there is a flipping gap between the circular protrusion 111 and the side wall 32.

[0067] According to one embodiment of the present invention, the pushing mechanism 4 includes a pushing frame 41, a driving member 42, a wedge block 43, and a fork head 44. The pushing frame 41 is mounted on the support frame 12, and the driving member 42, the wedge block 43, and the fork head 44 are mounted on the pushing frame 41. The driving member 42 drives the wedge block 43 to move along a first direction on the pushing frame 41. The side of the wedge block 43 abuts against the fork head 44 and can drive the fork head 44 to move along a second direction on the pushing frame 41. The first direction and the second direction are perpendicular. The fork head 44 engages with the side wall 32 of the mold 3. This can be achieved by providing a slide rail on the pushing frame 41, with the fork head 44 cooperating with the slide rail.

[0068] According to one embodiment of the present invention, the fork head 44 forks into the output end of the test mold 3 and has an arc-shaped groove 441. Two rotating rings 442 are symmetrically arranged in the arc-shaped groove 441, and the two rotating rings 442 abut against the side wall 32.

[0069] According to one embodiment of the present invention, the angle A is 0° to 1.4°, the pushing mechanism 4 pushes the mold 3 into place before the pressure head 2 presses down, and continuously presses against the outer edge of the mold 3 during the process of the pressure head 2 entering the mold 3 and pressing against the asphalt mixture, and the pushing mechanism 4 retracts after the pressure head 2 exits the mold.

[0070] According to one embodiment of the present invention, the asphalt mixture rotary compactor further includes an automatic control system, which is communicatively connected to the pressing mechanism 13 and the pushing mechanism 4, and controls the operation of the pressing mechanism 13 and the pushing mechanism 4.

[0071] According to one embodiment of the present invention, the automatic control system is connected to two pressure sensors. One of the pressure sensors is disposed between the pressure head 2 and the reaction frame 134 to detect the vertical pressure between the pressure head 2 and the asphalt mixture. The other pressure sensor is installed below the pushing mechanism 4 to detect the horizontal pressure between the mold 3 and the pushing mechanism 4.

[0072] The working process of the rotary compactor for asphalt mixtures of the present invention:

[0073] 1. First step: Input the required inner angle parameters into the human-computer interaction interface according to the experimental results.

[0074] 2. The second step is to run the equipment program, which will drive the motor to move the upper base to the designated position.

[0075] 3. The third step is to use the displacement sensor to accurately record the distance moved and calculate the angle value according to the program.

[0076] 4. The fourth step is for the equipment to perform compaction. During the operation, the pressure sensor detects the lateral shear force value.

[0077] As can be seen from the above technical solution, the advantages and positive effects of the asphalt mixture rotary compactor of the present invention are as follows:

[0078] The extension axis of the pressure head 2 of the present invention has an angle A with the pressing direction of the pressing mechanism 13. The pressure F of the pressing mechanism 13 is decomposed into two resultant forces: the pressure F1 of the pressure head 2 pressing against the asphalt mixture and the lateral shear force F2 of the pressure head 2 on the asphalt mixture. This allows the asphalt mixture to bear the lateral shear force F2 while being compacted, thereby simulating the generation of lateral shear force during the compaction process.

[0079] This invention utilizes a motor and transmission mechanism to automatically adjust the rotational inner angle. A moving mechanism, in conjunction with a high-precision sensor, ensures accurate adjustment. It conforms to the requirements of T0736-2025 Asphalt Mixture Specimen Preparation Method (Rotational Compaction Method) in JTG3410-2025 Highway Engineering Asphalt and Asphalt Mixture Test Procedures.

[0080] This invention can be configured with a shear stress testing system and a pressure head heating system if necessary. The angle adjustment device of this invention consists of upper and lower layers connected by a guide rail slider and a sliding wedge. A drive motor drives the sliding wedge to move, causing the upper structure to move back and forth. The upper mechanism contacts the edge of the mold to adjust the angle within the mold. The lower base is equipped with a displacement detection device to detect the movement distance of the upper base plate and calculate the angle within the mold based on a function.

[0081] According to the requirements of T0736-2025 Asphalt Mixture Specimen Preparation Method (Rotary Compaction Method) in the JTG3410-2025 Highway Engineering Asphalt and Asphalt Mixture Test Procedure, when the specimen is used for performance testing, since the directly formed specimen is not right-angled, the following treatment is required: (1) After the rotary compaction molding is completed, adjust the rotation angle to 0, and compact it 2-10 times until the specimen is right-angled. Then demold and store it. The drive motor controls the upper base to move back and forth to meet the requirements of the procedure. Since there is an internal rotation angle between the mold and the pressure head, the total pressure of the pressure head will be divided into the pressure perpendicular to the mold and the pressure horizontal to the mold.

[0082] Those skilled in the art should understand that the specific structures and processes shown in the above detailed embodiments are merely exemplary and not restrictive. Furthermore, those skilled in the art can combine the various technical features described above in various possible ways to form new technical solutions or make other modifications, all of which fall within the scope of this invention.

Claims

1. A rotary compactor for asphalt mixtures, characterized in that, include: The base includes a base, a support frame, and a pressing mechanism. The pressing mechanism is mounted on the support frame, and the base is disposed below the pressing mechanism. The pressure head is connected to the pressing mechanism via a thicker connecting body, such that there is an angle A between the extension axis of the pressure head and the pressing direction of the pressing mechanism. A trial mold is mounted on the base and is rotatable relative to the base; the trial mold is filled with asphalt mixture. A pushing mechanism is installed on the support frame and is capable of pushing the mold in the horizontal direction to flip relative to the base, and causing the pressure head to enter the mold and press against the asphalt mixture when it descends; After the pushing mechanism pushes the test mold into place, the pressing mechanism drives the pressing head to press down. The pressing head enters the test mold and presses against the asphalt mixture. The pressure of the pressing mechanism is decomposed into two forces: the pressure of the pressing head pressing against the asphalt mixture and the lateral shear force of the pressing head on the asphalt mixture. This allows the asphalt mixture to withstand lateral shear force while being compacted, thus realistically simulating the actual stress situation of asphalt pavement.

2. The rotary compactor for asphalt mixtures according to claim 1, characterized in that: The pressing mechanism includes a driver, a fine-tuning structure, a guide rail, and a reaction frame. The driver and the fine-tuning structure are mounted on the support frame. The guide rail is connected to the fine-tuning structure. The reaction frame is mounted below the fine-tuning structure. The driver drives the reaction frame to move up and down along the guide rail. The thicker connecting body is connected below the reaction frame.

3. The rotary compactor for asphalt mixtures according to claim 2, characterized in that: The fine-tuning structure includes an arc-shaped protrusion and a rotating plate. The arc-shaped protrusion is fixedly installed on the support frame. The rotating plate is provided with an arc-shaped groove, which engages with the arc-shaped protrusion. The rotating plate is elastically connected to the support frame and has a rotation gap. The reaction frame is connected below the rotating plate.

4. The rotary compactor for asphalt mixtures according to claim 2, characterized in that: The thicker connecting body is sleeved on the power output end of the reaction frame. The cross-section of the thicker connecting body is a wedge-shaped structure, and the cross-section of the pressure head is a T-shaped structure. The pressure head is fixedly installed below the thicker connecting body through a connector.

5. The rotary compactor for asphalt mixtures according to claim 1, characterized in that: The test mold is a cylindrical structure, including a side wall and a bottom plate. The side wall protrudes from the bottom plate. The base includes a circular protrusion, which is fastened between the side wall and the bottom plate, and there is a flipping gap between the circular protrusion and the side wall.

6. The rotary compactor for asphalt mixtures according to claim 5, characterized in that: The pushing mechanism includes a pushing frame, a driving member, a wedge, and a fork. The pushing frame is mounted on the support frame. The driving member, the wedge, and the fork are mounted on the pushing frame. The driving member drives the wedge to move along a first direction on the pushing frame. The side of the wedge abuts against the fork and can drive the fork to move along a second direction on the pushing frame. The first direction and the second direction are perpendicular. The fork engages with the test mold.

7. The rotary compactor for asphalt mixtures according to claim 6, characterized in that: The fork head engages with the output end of the test mold, which has an arc-shaped groove. Two rotating rings are symmetrically arranged in the arc-shaped groove, and the top of the two rotating rings rests against the side wall.

8. The rotary compactor for asphalt mixtures according to claim 1, characterized in that: The angle A is 0° to 1.4°. The pushing mechanism pushes the mold into place before the pressure head presses down, and continuously presses against the outer edge of the mold during the process of the pressure head entering the mold and pressing against the asphalt mixture. The pushing mechanism retracts after the pressure head exits the mold.

9. The rotary compactor for asphalt mixtures according to any one of claims 1-8, characterized in that: The asphalt mixture rotary compactor also includes an automatic control system, which is connected to the pressing mechanism and the pushing mechanism via communication and controls the actions of the pressing mechanism and the pushing mechanism.

10. The rotary compactor for asphalt mixtures according to claim 9, characterized in that: The automatic control system is connected to two pressure sensors. One of the pressure sensors is located between the pressure head and the reaction frame to detect the vertical pressure between the pressure head and the asphalt mixture. The other pressure sensor is installed below the pushing mechanism to detect the horizontal pressure between the mold and the pushing mechanism.

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