Device and method for preparing waste plastic modified asphalt

Abstract

The invention belongs to the technical field of modified asphalt preparation, and provides a waste plastic modified asphalt preparation device and method.The waste plastic modified asphalt preparation device comprises a horizontal pavement base, the plastic crushing assembly, the conveying assembly, the asphalt preheating assembly, the melting and mixing paving unit and the gradient compaction paving unit are connected to the machine body. After the plastic crushing assembly crushes waste plastic, the waste plastic is conveyed to the asphalt preheating assembly through the conveying assembly and is preliminarily mixed with the fed asphalt; the mixture enters the melting, mixing and paving unit, and is fully melted and mixed under the convection pushing of a bidirectional spiral blade, the turbulence effect of an arc-shaped baffle plate, the microscopic dispersion of an ultrasonic vibrator and the filling of a blind area of a reverse jet part; and finally, gradient compaction is performed through a compression roller set of the gradient compaction paving unit. According to the device, the efficiency is improved, the quality of modified asphalt is guaranteed through macroscopic and microscopic synergistic mixing and gradient compaction, the structure is simple, operation is easy, and waste plastic recycling is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of modified asphalt preparation technology, and particularly relates to an apparatus and method for preparing waste plastic modified asphalt. Background Technology

[0002] With the rapid development of the plastics industry, the amount of waste plastic generated globally is increasing at an alarming rate, and the environmental pollution caused by plastic waste is becoming increasingly serious. How to achieve efficient recycling and resource utilization of waste plastic has become an important issue that urgently needs to be addressed.

[0003] In the field of road engineering, asphalt, as a key building material, directly affects the service life and safety of roads. In recent years, research on the application of waste plastics in asphalt modification has gradually attracted attention. The addition of waste plastics can not only improve the core properties of asphalt such as high-temperature stability and low-temperature crack resistance, but also reduce the landfill or incineration of plastic waste, realizing a circular economy model of "treating waste with waste," which has significant environmental and economic benefits.

[0004] However, existing equipment for preparing modified asphalt from waste plastics still has many technical limitations, which restricts the large-scale application of this technology:

[0005] The process is disconnected and inefficient: the plastic crushing and asphalt preheating processes are often carried out independently and cannot be synchronized, resulting in long material transfer times and low overall preparation efficiency.

[0006] Insufficient mixing uniformity: The lack of an effective synergistic mixing mechanism during the melt mixing stage, relying solely on stirring or pushing in one direction, easily leads to problems such as material stratification and uneven dispersion of plastic particles, affecting the performance stability of modified asphalt.

[0007] Rigid compaction process: The spacing between the compaction rollers is mostly fixed, making it difficult to flexibly adjust the compaction intensity according to the state of the modified asphalt, and failing to achieve gradient compaction, which may result in insufficient density or structural damage in the final product.

[0008] Therefore, a device and method for preparing waste plastic modified asphalt are needed to solve the above problems. Summary of the Invention

[0009] The purpose of this invention is to provide an apparatus and method for preparing modified asphalt from waste plastics, so as to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a preparation device for modified asphalt from waste plastics, comprising a horizontal paving base, a plastic crushing component, a conveying component, an asphalt preheating component, a melt mixing paving unit, and a gradient compaction paving unit, wherein the upper part of the horizontal paving base is connected to the plastic crushing component, the conveying component, the asphalt preheating component, the melt mixing paving unit, and the gradient compaction paving unit.

[0011] In a further technical solution, the bottom of the plastic crushing component is connected to the asphalt preheating component via a conveying component, the asphalt preheating component is connected to the top of the melt-mix paving unit, and the bottom of the melt-mix paving unit is located directly above the gradient compaction paving unit.

[0012] In a further technical solution, the plastic crushing assembly includes a crushing shell, a feeding hopper at the top of the crushing shell, a first crushing roller and a second crushing roller that mesh with each other inside the crushing shell, a drive motor connected to one end of each of the first crushing roller and the second crushing roller, a screen at the bottom of the crushing shell, and a discharge port of the plastic crushing assembly below the screen.

[0013] In a further technical solution, the conveying component is configured as an auger conveyor, and the feed inlet below the auger conveyor is connected to the discharge outlet at the bottom of the plastic crushing component.

[0014] In a further technical solution, the asphalt preheating component includes a preheating shell and a mixing component. The outer wall of the preheating shell is provided with a preheating layer, and an electric heating wire is provided inside the preheating layer. The mixing component is connected inside the preheating shell. The top of the preheating shell is connected to two feed ports. One feed port is connected to the discharge port above the auger conveyor, and the other feed port is used for feeding asphalt raw materials.

[0015] A further technical solution includes a melting and mixing laying unit comprising a mixing shell, a pushing component, an ultrasonic vibrator, a blocking component, a connecting pipe, and a discharge pipe, wherein the connecting pipe is connected to the top of the mixing shell and the discharge pipe is connected to the bottom of the mixing shell;

[0016] The pushing component includes a rotating shaft rotatably connected inside the mixing shell. The top end of the rotating shaft is connected to a drive motor, which is also connected to the top end of the mixing shell. A first helical blade and a pushing component are connected externally to the rotating shaft. The pushing component includes a second helical blade and several connecting rods. The second helical blade is connected to the rotating shaft via these connecting rods. The second helical blade is located outside the first helical blade. Several reverse jet components are evenly connected within the second helical blade along the helical direction. Each reverse jet component is composed of a one-way valve. The one-way valve is a miniature spring-type one-way valve, with the valve body embedded within the second helical blade. The valve disc faces the opposite direction of the second helical blade's rotation (i.e., when the second helical blade rotates in a set direction, the valve disc closes the jet orifice by default under the action of centrifugal force and material pressure; when the centrifugal force generated by the rotation of the second helical blade causes the material pressure to exceed the spring force, the valve disc opens). The reverse jet component and the second helical blade are an integral structure (the one-way valve is installed after the opening), with no additional transmission components, relying solely on the rotation of the second helical blade to achieve its function.

[0017] The ultrasonic vibrator consists of a vibration controller, transducers (vibration heads), and connecting cables. The vibration controller is installed on the front of the horizontal paving base. The vibration controller is connected to several transducers via cables. The transducers (vibration heads) are rod-shaped or plate-shaped structures, made of waterproof and heat-resistant materials (such as titanium alloy). The transducers are fixed at the openings on the outer wall of the mixing shell (the openings need to be sealed to prevent material leakage). The bottom end of the transducer extends into the interior of the mixing shell, and the transducer is located above the second helical blade.

[0018] The blocking component comprises several first baffles and several second baffles connected to the inner wall of the mixing shell. The first baffles and the second baffles are both arc-shaped, and adjacent first baffles and second baffles are staggered. The second spiral blade is disposed within the several first baffles and the several second baffles.

[0019] A further technical solution is that the gradient compaction paving unit includes an adjustment frame and several pressure rollers. The pressure rollers are all located in a groove opened in the adjustment frame. Two electric push rods are connected in the groove. The two electric push rods are connected to the pressure rollers. Every two pressure rollers are symmetrically arranged, and the gap between the pressure roller groups gradually decreases from top to bottom.

[0020] A method for preparing waste plastic modified asphalt, applied to any of the above-described waste plastic modified asphalt preparation apparatus, includes the following steps:

[0021] S1. Waste plastic is fed into the plastic crushing assembly. The drive motor drives the first crushing roller and the second crushing roller to rotate, crushing the waste plastic. The crushed plastic falls through the screen into the discharge port and is conveyed into the asphalt preheating assembly by the conveying assembly. At the same time, asphalt is fed into the preheating shell of the asphalt preheating assembly.

[0022] S2. Control the operation of the agitator inside the asphalt preheating component. The working agitator will initially mix the crushed plastic and the preheated asphalt to obtain a mixture.

[0023] S3. The mixture enters the mixing shell of the molten mixing paving unit through the connecting pipe. The heating layer heats the mixing shell, melting the crushed plastic. At the same time, the drive motor drives the rotating shaft to rotate. The rotating shaft drives the first and second helical blades to rotate. Because the first and second helical blades have different pitches and rotate in opposite directions, the first helical blade pushes the material to the rear end of the mixing shell (discharge end direction), and the second helical blade pushes the material to the front end of the mixing shell (feeding end direction). A two-way convection circulation of the material is formed in the mixing shell, allowing the asphalt and molten plastic to be further mixed and homogenized.

[0024] Furthermore, during the convection process, the material impacts the first and second arc-shaped baffles, forcibly changing the flow direction and forming a turbulent region. Within this region, the material interweaves and wraps around each other, improving the mixing uniformity, breaking the laminar flow limitation of simple axial convection, and further enhancing the mixing effect.

[0025] Furthermore, the ultrasonic vibrator continuously outputs high-frequency vibrations, which act on the micro-particles of the material, breaking down agglomeration and bonding structures, allowing the plastic particles to be more evenly dispersed in the asphalt matrix, improving the mixing quality at the molecular / particle level, and forming a "macro + micro" synergy with macro-convective stirring, further improving the mixing effect;

[0026] Furthermore, when the second helical blade rotates, the reverse jet component intermittently sprays reverse material to counteract and mix with the mainstream material, filling the edge areas that the blade agitation may have missed (such as near the inner wall of the mixing shell or between the blades), further disrupting the material distribution and making the mixing more thorough.

[0027] S4. Modified asphalt is conveyed to the gradient compaction paving unit through the discharge pipe. The distance between the corresponding two pressure rollers is adjusted as needed. Since one end of each of the two sets of pressure rollers is connected to a motor, the working motor drives the two pressure rollers to rotate in opposite directions. Each set of pressure rollers rotating in opposite directions compacts the modified asphalt. Because the distance between the pressure roller sets from top to bottom decreases, gradient compaction is carried out under the action of the pressure roller sets distributed in the upper and lower parts, thus completing the preparation of waste plastic modified asphalt.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] This invention improves preparation efficiency: the device integrates processes such as plastic crushing, asphalt preheating, melting and mixing, and gradient compaction into a continuous process, achieving simultaneous processing and avoiding the time loss caused by the separation of each step in traditional equipment, thus significantly shortening the preparation cycle.

[0030] This invention enhances mixing uniformity: during the melting and mixing stage, the first and second helical blades form a bidirectional convection circulation, which, together with the arc-shaped staggered first and second baffles, forcibly changes the material flow direction to form turbulence, breaks the laminar flow limitation, and improves the macroscopic mixing effect;

[0031] Ultrasonic vibrators break down the agglomeration structure of materials at the microscopic level, allowing plastic particles to be evenly dispersed in the asphalt matrix. In conjunction with macroscopic mixing, they achieve a dual mixing process of "macroscopic + microscopic", significantly improving the quality of modified asphalt.

[0032] The reverse jet component on the second helical blade can intermittently spray material in the opposite direction to fill the blind spots of blade mixing (such as the inner wall of the mixing shell and the gaps between blades), further ensuring that the material is fully mixed;

[0033] This invention optimizes the compaction effect: the gradient compaction paving unit adjusts the gap between the rollers via an electric push rod, so that the gap between the rollers gradually decreases from top to bottom, achieving gradient compaction of modified asphalt. It can be flexibly adjusted according to actual needs to ensure the density and structural stability of the final product. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0035] Figure 2 This is a partial frontal three-dimensional cross-sectional structural diagram of the present invention;

[0036] Figure 3 This is a frontal three-dimensional cross-sectional structural diagram of the hybrid shell of the present invention;

[0037] Figure 4 This is a three-dimensional structural schematic diagram of the second helical blade of the present invention;

[0038] Figure 5 This is a top-view cross-sectional structural diagram of the hybrid shell of the present invention.

[0039] In the diagram: 1. Horizontal paving base; 2. Plastic crushing assembly; 3. Conveying assembly; 4. Asphalt preheating assembly; 5. Gradient compaction paving unit; 51. Adjusting frame; 52. Pressure roller; 6. Melt mixing paving unit; 61. Mixing shell; 62. Pushing assembly; 621. Rotating shaft; 622. Drive motor; 623. First helical blade; 624. Pushing component; 6241. Second helical blade; 6242. Reverse jet component; 6243. Connecting rod; 63. Ultrasonic vibrator; 64. Blocking component; 641. First baffle; 642. Second baffle; 65. Connecting pipe; 66. Discharge pipe; 67. Heating layer. Detailed Implementation

[0040] The present invention will be further described below with reference to embodiments.

[0041] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0042] Please see Figure 1-5 The present invention provides a device for preparing modified asphalt from waste plastics, including a horizontal paving base 1, and a plastic crushing component 2, a conveying component 3, an asphalt preheating component 4, a melt mixing paving unit 6 and a gradient compaction paving unit 5 connected above the horizontal paving base 1.

[0043] The bottom of the plastic crushing component 2 is connected to the asphalt preheating component 4 via the conveying component 3. The asphalt preheating component 4 is connected to the top of the melt-mix paving unit 6. The bottom of the melt-mix paving unit 6 is located directly above the gradient compaction paving unit 5.

[0044] The plastic crushing assembly 2 includes a crushing shell, a feed hopper at the top of the crushing shell, a first crushing roller and a second crushing roller that mesh with each other inside the crushing shell, a drive motor connected to one end of each of the first crushing roller and the second crushing roller, a screen at the bottom of the crushing shell, and a discharge port of the plastic crushing assembly 2 below the screen.

[0045] The conveying component 3 is a screw conveyor, and the feed inlet below the screw conveyor is connected to the discharge outlet at the bottom of the plastic crushing component 2.

[0046] The asphalt preheating component 4 includes a preheating shell and a mixing component. The outer wall of the preheating shell is provided with a preheating layer, and an electric heating wire is provided inside the preheating layer. The mixing component is connected inside the preheating shell. The top of the preheating shell is connected to two feed ports. One feed port is connected to the discharge port above the auger conveyor, and the other feed port is used for feeding asphalt raw materials.

[0047] The melt-mixing and laying unit 6 includes a mixing shell 61, a pushing component 62, an ultrasonic vibrator 63, a blocking component 64, a connecting pipe 65, and a discharge pipe 66. The connecting pipe 65 is connected to the top of the mixing shell 61, and the discharge pipe 66 is connected to the bottom of the mixing shell 61.

[0048] The actuating component 62 includes a rotating shaft 621, which is rotatably connected inside the mixing shell 61. The top end of the rotating shaft 621 is connected to a drive motor 622, which is also connected to the top end of the mixing shell 61. A first helical blade 623 and a driving member 624 are connected to the outside of the rotating shaft 621. The driving member 624 includes a second helical blade 6241 and several connecting rods 6243. The second helical blade 6241 is connected to the rotating shaft 621 through several connecting rods 6243. The second helical blade 6241 is located outside the first helical blade 623. Several reverse jet members 6242 are evenly connected inside the second helical blade 6241 along the helical direction. The reverse jet members 6242 are composed of one-way valves. The one-way valves are miniature spring-type one-way valves. The valve body is embedded in the second helical blade 6241, and the valve disc faces the opposite direction of the rotation of the second helical blade 6241. The reverse jet members 6242 and the second helical blade 6241 are an integral structure.

[0049] The ultrasonic vibrator 63 consists of a vibration controller, transducers (vibration heads), and connecting cables. The vibration controller is installed on the front of the horizontal paving base 1. The vibration controller is connected to several transducers via cables. The several transducers (vibration heads) are rod-shaped or plate-shaped structures and are made of waterproof and heat-resistant materials (such as titanium alloy). The transducers are fixed at the openings on the outer wall of the mixing shell 61 (the openings need to be sealed to prevent material leakage). The bottom end of the transducer extends into the interior of the mixing shell 61, and the transducer is located above the second helical blade 6241.

[0050] The blocking member 64 includes a plurality of first baffles 641 and a plurality of second baffles 642. The plurality of first baffles 641 and the plurality of second baffles 642 are connected to the inner wall of the mixing shell 61. The first baffles 641 and the second baffles 642 are both arc-shaped. Adjacent first baffles 641 and second baffles 642 are staggered. The second spiral blade 6241 is disposed within the plurality of first baffles 641 and the plurality of second baffles 642.

[0051] The gradient compaction paving unit 5 includes an adjusting frame 51 and several pressure rollers 52. The pressure rollers 52 are all located in a groove opened in the adjusting frame 51. Two electric push rods are connected in the groove. The two electric push rods are connected to the pressure rollers 52. Every two pressure rollers 52 are symmetrically arranged, and the gap between the groups of pressure rollers 52 gradually decreases from top to bottom.

[0052] A method for preparing waste plastic modified asphalt, applied to the waste plastic modified asphalt preparation apparatus described in the above embodiments, includes the following steps:

[0053] S1. Waste plastic is fed into the plastic crushing component 2. The drive motor drives the first crushing roller and the second crushing roller to rotate, crushing the waste plastic. The crushed plastic falls through the screen into the discharge port and is conveyed to the asphalt preheating component 4 by the conveying component 3. At the same time, asphalt is fed into the preheating shell of the asphalt preheating component 4.

[0054] S2. Control the operation of the agitator inside the asphalt preheating component 4. The working agitator will initially mix the crushed plastic and the preheated asphalt to obtain a mixture.

[0055] S3. The mixture enters the mixing shell 61 in the melt mixing and laying unit 6 through the connecting pipe 65. The heating layer heats the mixing shell 61, melting the crushed plastic. At the same time, the drive motor 622 drives the rotating shaft 621 to rotate. The rotating shaft 621 drives the first spiral blade 623 and the second spiral blade 6241 to rotate. Because the first spiral blade 623 and the second spiral blade 6241 have different pitches and rotate in opposite directions, the first spiral blade 623 pushes the material towards the rear end (discharge end direction) of the mixing shell 61, and the second spiral blade 6241 pushes the material towards the front end (feed end direction) of the mixing shell 61, forming a bidirectional convection circulation of the material in the mixing shell 61. During the convection process, the material hits the arc-shaped first baffle 641 and the second baffle 642, and the flow direction is forcibly changed, forming a turbulent area. The ultrasonic vibrator 63 continuously outputs high-frequency vibration. When the second spiral blade 6241 rotates, the reverse jet component 6242 intermittently sprays material in the opposite direction.

[0056] S4. Modified asphalt is conveyed to the gradient compaction paving unit 5 through the discharge pipe 66. The distance between the two corresponding pressure rollers 52 is adjusted, and the motor drives the two pressure rollers 52 to rotate in opposite directions to perform gradient compaction on the modified asphalt, thus completing the preparation of waste plastic modified asphalt.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preparing modified asphalt from waste plastics, comprising a horizontal paving base (1), a plastic crushing assembly (2), a conveying assembly (3), an asphalt preheating assembly (4), a melt-mixing paving unit (6), and a gradient compaction paving unit (5), characterized in that: The horizontal paving base (1) is connected above the plastic crushing assembly (2), the conveying assembly (3), the asphalt preheating assembly (4), the melt mixing paving unit (6), and the gradient compaction paving unit (5).

2. The apparatus for preparing waste plastic modified asphalt according to claim 1, characterized in that: The bottom of the plastic crushing component (2) is connected to the asphalt preheating component (4) via the conveying component (3). The asphalt preheating component (4) is connected to the top of the melt-mix paving unit (6). The bottom of the melt-mix paving unit (6) is located directly above the gradient compaction paving unit (5).

3. The apparatus for preparing waste plastic modified asphalt according to claim 1, characterized in that: The plastic crushing assembly (2) includes a crushing shell, a feeding hopper at the top of the crushing shell, a first crushing roller and a second crushing roller that mesh with each other inside the crushing shell, a drive motor at one end of each of the first crushing roller and the second crushing roller, a screen at the bottom of the crushing shell, and a discharge port of the plastic crushing assembly (2) below the screen.

4. The apparatus for preparing waste plastic modified asphalt according to claim 1, characterized in that: The conveying component (3) is a screw conveyor, and the feed port below the screw conveyor is connected to the discharge port at the bottom of the plastic crushing component (2).

5. The apparatus for preparing waste plastic modified asphalt according to claim 1, characterized in that: The asphalt preheating component (4) includes a preheating shell and a mixing component. The outer wall of the preheating shell is provided with a preheating layer, and an electric heating wire is provided inside the preheating layer. The mixing component is connected inside the preheating shell. The top of the preheating shell is connected to two feed ports, one of which is connected to the discharge port above the auger conveyor.

6. The apparatus for preparing waste plastic modified asphalt according to claim 1, characterized in that: The melt-mixing and laying unit (6) includes a mixing shell (61), a pushing component (62), an ultrasonic vibrator (63), a blocking component (64), a connecting pipe (65), and a discharge pipe (66). The connecting pipe (65) is connected to the top of the mixing shell (61), and the discharge pipe (66) is connected to the bottom of the mixing shell (61). The pushing component (62) includes a rotating shaft (621), which is rotatably connected inside the mixing shell (61). The top end of the rotating shaft (621) is connected to a drive motor (622), which is connected to the top end of the mixing shell (61). A first helical blade (623) and a pushing member (624) are connected to the outside of the rotating shaft (621). The pushing member (624) includes a second helical blade (6241) and several connecting rods (6243). The second helical blade (6241) is connected to the rotating shaft (621) through several connecting rods (6243). The second helical blade (6241) is located outside the first helical blade (623). Several reverse jet members (6242) are evenly connected inside the second helical blade (6241) along the helical direction. The reverse jet members (6242) are composed of one-way valves, and the one-way valves are miniature spring-type one-way valves. The ultrasonic vibrator (63) consists of a vibration controller, a transducer (vibration head) and a connecting cable. The vibration controller is installed on the front of the horizontal paving base (1). The vibration controller is connected to several transducers through cables. The transducers are fixed at the opening on the outer wall of the mixing shell (61) (the opening needs to be sealed to prevent material leakage). The bottom end of the transducer extends into the interior of the mixing shell (61). The transducer is located above the second helical blade (6241). The blocking member (64) includes a plurality of first baffles (641) and a plurality of second baffles (642). The plurality of first baffles (641) and the plurality of second baffles (642) are connected to the inner wall of the mixing shell (61). The first baffles (641) and the second baffles (642) are both arc-shaped. Adjacent first baffles (641) and second baffles (642) are staggered. The second spiral blade (6241) is disposed within the plurality of first baffles (641) and the plurality of second baffles (642).

7. The apparatus for preparing waste plastic modified asphalt according to claim 1, characterized in that: The gradient compaction paving unit (5) includes an adjustment frame (51) and several pressure rollers (52). The pressure rollers (52) are all located in a groove opened in the adjustment frame (51). Two electric push rods are connected in the groove. The two electric push rods are connected to the pressure rollers (52). Each pair of pressure rollers (52) are symmetrically arranged.

8. A method for preparing waste plastic modified asphalt, applied to the waste plastic modified asphalt preparation apparatus according to any one of claims 1-7, characterized in that: Includes the following steps: S1. Waste plastic is put into the plastic crushing assembly (2), and the drive motor drives the first crushing roller and the second crushing roller to rotate to crush the waste plastic. The crushed plastic falls into the discharge port through the screen and is transported to the asphalt preheating assembly (4) through the conveying assembly (3). At the same time, asphalt is put into the preheating shell of the asphalt preheating assembly (4). S2. Control the operation of the agitator in the asphalt preheating component (4). The working agitator will initially mix the crushed plastic and the preheated asphalt to obtain a mixture. S3. The mixture enters the mixing shell (61) in the melt mixing and laying unit (6) through the connecting pipe (65). The heating layer heats the mixing shell (61) to melt the crushed plastic. At the same time, the drive motor (622) drives the rotating shaft (621) to rotate. The rotating shaft (621) drives the first spiral blade (623) and the second spiral blade (6241) to rotate. Because the first spiral blade (623) and the second spiral blade (6241) have different pitches and opposite rotation directions, the first spiral blade (623) pushes the material towards the rear end (out) of the mixing shell (61). The material is pushed towards the front end (feeding end direction) of the mixing shell (61) by the second spiral blade (6241), forming a bidirectional convection circulation of the material in the mixing shell (61), allowing the asphalt and molten plastic to be further mixed and homogenized; and the material impacts the arc-shaped first baffle (641) and the second baffle (642) during the convection process, and the flow direction is forcibly changed to form a turbulent area; and the ultrasonic vibrator (63) continuously outputs high-frequency vibration; and when the second spiral blade (6241) rotates, the reverse jet component (6242) intermittently sprays reverse material; S4. Modified asphalt is conveyed to the gradient compaction paving unit (5) through the discharge pipe (66). The distance between the two corresponding pressure rollers (52) is adjusted, and the motor drives the two pressure rollers (52) to rotate in opposite directions to perform gradient compaction on the modified asphalt and complete the preparation.

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