A device for evaluating dispersion uniformity of asphalt mixture direct injection modifier

Abstract

The utility model relates to the field of asphalt mixture performance detection, concretely relates to a kind of asphalt mixture direct injection modifier dispersion uniformity evaluation equipment, including agitator and stirring mechanism, stirring mechanism includes stirring shaft, stirring shaft is eccentric to the agitator, stirring shaft is connected on the support above the agitator, stirring shaft is connected with driving mechanism, driving mechanism is used to drive stirring shaft to revolve around the inner wall of agitator while rotating, stirring shaft is fixed with stirring vane, and stirring vane includes stirring frame, and two layers of spiral vane are arranged in stirring frame.The utility model can solve the problem of uneven stirring when the modifier dispersion uniformity is evaluated in small batch of asphalt mixture in laboratory in prior art.

Description

Technical Field

[0001] This utility model relates to the field of asphalt mixture performance testing, specifically to a device for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures. Background Technology

[0002] In the field of road engineering materials research and development, the uniform dispersion of direct-injection modifiers in asphalt mixtures is a core prerequisite for accurately evaluating their road performance (such as high-temperature stability and low-temperature crack resistance). Related studies require thorough mixing of the direct-injection modifier with the asphalt mixture, followed by evaluation of the dispersion effect through microscopic observation and performance testing. Therefore, an efficient and uniform mixing device is crucial for ensuring experimental accuracy.

[0003] In existing technologies, such as the asphalt mixing tank disclosed in patent CN102641682A, structural optimizations have been made to address the problems of dead zones and asphalt stagnation that are prone to occur in traditional horizontal mixing devices. It adopts a vertical tank design with a reducer driving a single mixing shaft, on which multiple sets of mixing blades are configured. The rotation of the mixing blades promotes the flow of materials, which improves the uniformity of mixing to a certain extent in large-scale asphalt production scenarios.

[0004] However, in scenarios involving the evaluation of the dispersion uniformity of modifiers in small-volume asphalt mixtures, the limitations of this mixing tank become increasingly apparent:

[0005] In laboratory small-batch mixing tests, the total amount of material is small, and the gap between the mixing blades and the inner wall of the vertical tank occupies a relatively large proportion of the material's movement space. The mixture is very easy to get stuck in the gap, forming new dead corners that are difficult to be covered by the mixing action. At the same time, the small amount of material has a higher probability of contact with the inner wall of the tank. Due to the temperature and viscosity characteristics of the asphalt mixture, it is easy to adhere to the wall surface and cannot participate in effective mixing circulation, resulting in uneven dispersion of the modifier, which directly affects the accuracy of evaluation results such as microscopic observation and performance testing. Utility Model Content

[0006] The present invention aims to provide an equipment for evaluating the dispersion uniformity of direct-added modifiers in asphalt mixtures, in order to solve the problem of uneven mixing when the modifiers are dispersed uniformly in small batches of asphalt mixtures in the laboratory in the existing technology.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A device for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures includes a mixing pot and a mixing mechanism. The mixing mechanism includes a mixing shaft, which is eccentrically positioned relative to the mixing pot. The mixing shaft is connected to a support above the mixing pot and a drive mechanism is connected to the mixing shaft. The drive mechanism drives the mixing shaft to rotate on its own axis while revolving around the inner wall of the mixing pot. Mixing blades are fixed on the mixing shaft. The mixing blades include a mixing frame, and two layers of spiral blades are arranged inside the mixing frame.

[0009] Preferably, as an improvement, the two helical blades rotate in opposite directions.

[0010] Preferably, as an improvement, the bottom of the stirring frame is an outwardly convex arc shape, and the bottom of the stirring pot is an arc shape that matches the bottom of the stirring frame.

[0011] Preferably, as an improvement, an operating platform is provided on one side of the mixing pot, and a support frame is connected to the bottom of the support bracket. The support frame is slidably connected inside the operating platform, and a cylinder is provided inside the operating platform. The output shaft of the cylinder is connected to the support frame. The mixing pot is connected to a tilting shaft, which is connected to a tilting motor provided inside the operating platform. A discharge valve is provided on the operating platform, and both the discharge valve and the tilting motor are electrically connected to the controller.

[0012] Preferably, as an improvement, a motor is installed inside the bracket, a sun gear is fixed on the output shaft of the motor, a planet gear is meshed on the outer side of the sun gear, the stirring shaft is coaxially connected to the planet gear, a gear ring is meshed on the outer side of the planet gear, a connecting arm is fixedly connected to the output shaft of the motor, and the other end of the connecting arm is movably connected to the stirring shaft.

[0013] Preferably, as an improvement, the motor is electrically connected to a controller, and the controller is electrically connected to a speed adjustment button, a time adjustment knob, and a display screen, which are located on the control panel.

[0014] Preferably, as an improvement, the cylinder is electrically connected to the controller, and a lifting adjustment knob is provided on the control panel, which is electrically connected to the controller.

[0015] Preferably, as an improvement, the mixing pot is provided with a jacket, in which heat transfer oil and a heating element are provided. The heating element is electrically connected to the controller. A temperature adjustment knob is provided on the operating table and is electrically connected to the controller. A temperature sensor is installed inside the inner wall of the mixing pot and is electrically connected to the controller. The controller is electrically connected to an over-temperature alarm.

[0016] The effect of this solution is:

[0017] 1. By using a planetary gear system, the stirring shaft achieves a compound motion of "revolution (around the center of the pot) + rotation (its own rotation)". Compared with the traditional fixed-center stirring method, this eccentric motion can actively "sweep" across the entire pot wall, eliminating the "dead zone" of materials adhering to the inner wall, allowing the modifier and the mixture to fully contact each other in all areas of the pot, ensuring uniform dispersion from the perspective of motion trajectory.

[0018] 2. The unique stirring blades in this design further enhance mixing uniformity: the stirring frame constructs a rigid mixing boundary, and the arc shape at the bottom of the stirring frame adapts to the arc shape of the pot body, strengthening the disturbance to the material at the bottom. Additionally, the two layers of counter-rotating spiral blades form a "convective circulation field," with the opposing rotations promoting bidirectional flow of the material both vertically and horizontally, avoiding material stratification / accumulation caused by a single rotation direction. This allows the directly injected modifier particles to be repeatedly sheared and diffused in the complex flow field, solving the problems of agglomeration and localized enrichment.

[0019] 3. The cylinder-driven support lifts and lowers, easily switching between the "mixing position" and the "material handling position," facilitating loading, cleaning, and observation. Additionally, the tilting motor, linked to the tilting shaft, allows for rapid material dumping, replacing manual unloading. This is particularly suitable for high-temperature mixture evaluation scenarios, reducing operational risks and labor intensity.

[0020] 4. The controller is linked with the motor and speed adjustment button, supporting precise setting of stirring speed and duration. It can simulate different construction conditions, creating a "controllable variable" evaluation environment for the dispersibility of the modifier and enhancing the scientific rigor of experimental data. The interlayer heat transfer oil works in conjunction with the heating element to achieve stable temperature control. The temperature sensor provides real-time temperature feedback, and the over-temperature alarm provides protection, ensuring stable asphalt viscosity. Furthermore, the temperature control and stirring parameters work together to assist in achieving uniform dispersion from a thermodynamic perspective, improving the accuracy of evaluation. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0022] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model.

[0023] Figure 3 This is a structural schematic diagram of an embodiment of the present utility model.

[0024] Figure 4 This is a structural schematic diagram of an embodiment of the present utility model.

[0025] The reference numerals in the accompanying drawings include: power switch 1, temperature adjustment knob 2, time adjustment knob 3, lifting adjustment knob 4, speed adjustment knob 5, display screen 6, support frame 7, discharge valve 8, stirring blade 9, mixing pot 10, base 11, stirring shaft 12, bracket 13, stirring frame 14, spiral blade 15, operating table 16, tilting shaft 17, sun gear 18, planetary gear 19, gear ring 20, connecting arm 21. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] Example 1

[0028] like Figure 1 As shown, an equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures includes a base 11, a mixing pot 10, a mixing mechanism, a driving mechanism, and an operating table 16. The mixing pot 10 and the operating table 16 are both fixed on the base 11, and the operating table 16 is located on one side of the mixing pot 10. The driving mechanism is used to drive the mixing mechanism to operate.

[0029] The mixing pot 10 is a vertical cylindrical structure made of stainless steel. In this embodiment, the mixing pot 10 has a diameter of 120mm, a depth of 120mm, and a volume of approximately 1.7L. The bottom of the pot has an outwardly concave arc design. A closed jacket is provided on the outer side and bottom of the pot, filled with heat-conducting oil. Heating elements are evenly arranged along the inner wall of the jacket. In this embodiment, the heating elements are electric heating tubes, electrically connected to a controller, which is a PLC. A temperature adjustment knob 2 is installed on the control panel 16; rotating the temperature adjustment knob 2 allows adjustment of the heating power via the controller. A temperature sensor is installed on the inner wall of the bottom of the mixing pot 10. In this embodiment, the temperature sensor is a thermocouple, with its probe in contact with the inner wall of the pot to collect the temperature of the material inside in real time. The temperature sensor is electrically connected to the controller, which is electrically connected to an over-temperature alarm, which can be a buzzer alarm.

[0030] Combination Figure 2As shown, the stirring mechanism is mounted on a bracket 13 above the mixing pot 10. The stirring mechanism includes a stirring shaft 12, the axis of which is offset from the central axis of the mixing pot 10. Stirring blades 9 are fixed to the stirring shaft 12 (via flanges, etc.). The stirring blades 9 include a stirring frame 14, which can be welded from stainless steel plates. The frame is a square frame adapted to the mixing pot 10, with an outwardly convex arc at the bottom. The radius of the arc is the same as the bottom of the mixing pot 10, and the gap between the side wall of the frame and the inner wall of the mixing pot 10 is 2mm. Two layers of spiral blades 15 are arranged axially inside the stirring frame 14. The upper blade rotates clockwise, and the lower blade rotates counterclockwise. The blades are stamped from stainless steel plates, and the edges of the blades are welded to the inner wall of the stirring frame 14. The welded joints are ground to prevent material retention.

[0031] Combination Figure 3 and Figure 4 As shown, the drive mechanism is integrated within the bracket 13. The drive mechanism includes a motor, and the motor output shaft is connected to a sun gear 18 via a coupling. Planet gears 19 mesh with the outer side of the sun gear 18, and the outer side of the planet gears 19 meshes with a gear ring 20 fixed within the bracket 13. The motor output shaft and the planet gears 19 are connected by a connecting arm 21. One end of the connecting arm 21 is fixedly connected to the motor output shaft via a key, and the other end of the connecting arm 21 is movably connected to the axle of the planet gears 19 via a bearing.

[0032] The operating table 16 is a rectangular cabinet. A support frame 7 is bolted to the bottom of the bracket 13 and slidably connected inside the operating table 16. A cylinder is installed inside the operating table 16, and the piston rod of the cylinder is connected to the support frame via a flange. A solenoid valve is connected to the cylinder's air inlet, and the solenoid valve is electrically connected to a controller. The cylinder's extension and retraction are controlled by a lifting adjustment knob 4 on the surface of the operating table 16, thus raising and lowering the stirring mechanism. A tilting motor is installed inside the operating table 16. A tilting shaft 17 is welded and fixed to the left side of the stirring pot 10. The tilting motor is connected to the tilting shaft 17 via a reducer. A discharge valve 8 is installed on the operating table 16, and it is electrically connected to the controller. The controller is electrically connected to the tilting motor. A display screen 6 is also installed on the operating table 16, and it is electrically connected to the controller. A power supply is provided inside the operating table 16 to power the various electrical components, and a power switch 1 is installed on the operating table 16.

[0033] In use, the cylinder is extended by adjusting the lifting knob 4 to raise the mixing mechanism to its highest position. The required amount of asphalt mixture and direct-injection modifier are then added to the mixing pot 10. The lifting knob 4 is then operated to lower the mixing mechanism until the bottom of the mixing blades 9 are in contact with the bottom of the mixing pot 10. The speed of the mixing shaft 12 is set by the speed adjustment knob 5, the mixing time is set by the time adjustment knob 3, and the heating temperature is set by the temperature adjustment knob 2. The equipment is started, and the motor drives the sun gear 18 to rotate. The planetary gears 19 revolve around the sun gear 18 and the gear ring 20 under the action of the sun gear 18 and the gear ring 20. Simultaneously, the planetary gears 19 rotate on their own axis, thereby driving the mixing shaft 12 to revolve along the inner wall of the mixing pot 10 while rotating on its own axis. The mixing frame 14 scrapes the pot wall, and the spiral blades 15 push the material up and down in convection, achieving uniform mixing of the material. After mixing is completed, the equipment automatically stops heating, the control cylinder raises the mixing mechanism, and then the flip motor drives the mixing pot 10 to rotate 90°, pouring the material into the collection container, thus completing one evaluation mixing process.

[0034] During the mixing process, the temperature sensor monitors the temperature of the material inside the mixing pot 10 in real time. When the temperature sensor detects that the temperature inside the pot exceeds the set value (such as 180°C), the controller immediately cuts off the power to the heating element and triggers the buzzer to emit a continuous alarm sound.

[0035] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An apparatus for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures, characterized in that: The device includes a mixing pot and a mixing mechanism. The mixing mechanism includes a mixing shaft, which is eccentrically positioned relative to the mixing pot. The mixing shaft is connected to a support above the mixing pot and a drive mechanism is connected to the mixing shaft. The drive mechanism is used to drive the mixing shaft to rotate on its own axis while revolving around the inner wall of the mixing pot. Mixing blades are fixed on the mixing shaft. The mixing blades include a mixing frame, and two layers of spiral blades are arranged inside the mixing frame.

2. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 1, characterized in that: The two layers of helical blades rotate in opposite directions.

3. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 2, characterized in that: The bottom of the mixing frame is an outward-convex arc shape, and the bottom of the mixing pot is an arc shape that matches the bottom of the mixing frame.

4. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 1, characterized in that: An operating platform is set on one side of the mixing pot. A support frame is connected to the bottom of the support bracket. The support frame is slidably connected to the operating platform. A cylinder is set inside the operating platform. The output shaft of the cylinder is connected to the support frame. The mixing pot is connected to a tilting shaft. The tilting shaft is connected to a tilting motor set inside the operating platform. A discharge valve is set on the operating platform. Both the discharge valve and the tilting motor are electrically connected to the controller.

5. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 4, characterized in that: A motor is installed inside the bracket. A sun gear is fixed on the output shaft of the motor. Planet gears mesh with the outer side of the sun gear. The stirring shaft is coaxially connected to the planet gears. A gear ring meshes with the outer side of the planet gears. A connecting arm is fixedly connected to the output shaft of the motor. The other end of the connecting arm is movably connected to the stirring shaft.

6. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 1, characterized in that: The motor is electrically connected to a controller, which is electrically connected to a speed adjustment button, a time adjustment knob, and a display screen. The speed adjustment button, time adjustment knob, and display screen are located on the control panel.

7. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 6, characterized in that: The cylinder is electrically connected to the controller, and a lifting adjustment knob is provided on the control panel. The lifting adjustment knob is electrically connected to the controller.

8. The equipment for evaluating the dispersion uniformity of direct-injection modifiers in asphalt mixtures according to claim 7, characterized in that: The mixing pot is equipped with a jacket, inside which heat transfer oil and a heating element are installed. The heating element is electrically connected to the controller. A temperature adjustment knob is installed on the control panel, and the temperature adjustment knob is electrically connected to the controller. A temperature sensor is installed inside the mixing pot, and the temperature sensor is electrically connected to the controller. The controller is electrically connected to an over-temperature alarm.

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