WO2020062891A1

WO2020062891A1 - Apparatus for hot milling by layer, hot air-microwave composite hot in-place recycling machine set and by-layer processing method thereof

Info

Publication number: WO2020062891A1
Application number: PCT/CN2019/087324
Authority: WO
Inventors: 任化杰; 张江勇; 张陈; 郑健龙; 焦生杰; 李家春; 陆平; 燕铎; 成九瑞; 理俊杰; 李骁斐; 樊丽丽; 张青国; 解睿; 丁艳; 顾海荣; 武浩浩; 郭荣东; 张青梅; 吴振毅
Original assignee: 江苏集萃道路工程技术与装备研究所有限公司
Priority date: 2018-09-29
Filing date: 2019-05-17
Publication date: 2020-04-02
Also published as: CN109183583A; CN109183583B

Abstract

An apparatus for hot milling by layer, comprising, sequentially arranged, a hot air heating machine (1), a front milling heater (2), and a rear milling heater (3). The hot air heater (1) is used to heat an old asphalt road surface. The front milling heater (2) comprises a front milling heater body, a front milling device (2-1) being provided on the front section thereof. The rear milling heater (3) comprises a rear milling heater body, a rear milling device being provided on the back section thereof. Further disclosed is a hot air-microwave composite hot in-place recycling machine set comprising the apparatus for hot milling by layer, and a recycling method of adding material and remixing, a recycling method of adding material, remixing, and additional paving, and a recycling method of adding material and remixing for upper and middle layers simultaneously. Using the techniques of hot-air heating asphalt road surfaces in place by layer, hot milling by layer, and conveying and heating by layer allows for semi-closed low-temperature processing, lowers energy consumption, and raises processing efficiency.

Description

Layered thermal milling equipment, hot air microwave composite in-situ thermal regeneration complete set and layered construction method

Technical field

The invention belongs to the technical field of road maintenance equipment, and particularly relates to a layered thermal milling equipment, a hot air microwave composite in-situ thermal regeneration complete unit and a layered construction method thereof.

Background technique

The huge maintenance workload of national and provincial trunk roads, especially expressways, the high quality of maintenance engineering quality, and the maintenance operation environment under the condition of large traffic volume have prompted us to seek a new maintenance method-in-situ thermal regeneration, which is an Dedicated in-situ thermal regeneration equipment, which heats and mills the asphalt pavement, and then mixes it with certain new aggregates, new asphalt, and regenerants. After mixing, paving, and rolling, it achieves a certain depth on the surface at one time. Recycling of old asphalt pavement within range.

At present, the existing in-situ thermal regeneration units at home and abroad have the following defects:

(1) Scorched roads, vegetation damage, and environmental pollution. Pavement heaters often use fuel / gas open flame heating, gas infrared heating, or extensive high-power diesel hot air circulation heating methods. Asphalt pavement heating temperature is not easy to accurately control, and it is easy to cause aging and coking of asphalt pavement. Road performance after regeneration is reduced. High temperature and hot smoke around the construction will easily lead to green belts and tree charring, accompanied by a large amount of toxic blue smoke, which will pollute the environment;

(2) The deep disease cannot be treated, and the construction process has poor adaptability. At present, in-situ thermal regeneration units on the market adopt a one-time heating depth that is mostly limited to a depth of 30mm to 40mm, resulting in limited regeneration thickness, deep-seated diseases that are not well handled, and poor working conditions. From the perspective of construction technology, currently only The realization of the re-mixing and re-adding process and the re-laying and re-laying process can not achieve the simultaneous thermal regeneration in situ of the upper layer and the middle layer, and the re-mixing process of the re-mixing and paving process does not add a certain proportion of new asphalt mixture. However, by adding an appropriate amount of regenerant and re-spreading to form a regenerating layer, and then laying a new thickness of a new asphalt mixture on the regenerating layer, the true double-layer paving has not been achieved.

(3) The temperature gradient between layers is large, and the aggregate is easy to be destroyed during milling, and the temperature of the recycled material is low, which affects the recycling quality. According to statistics, the temperature of the asphalt material 10mm to 20mm thick on the top of the asphalt pavement is too high (up to 240 ° C), but the temperature of the asphalt material at the bottom 30mm to 50mm is only 70 ° C to 80 ° C, the temperature gradient between layers is large, and the heating is uneven; And because the bottom temperature is low, it is easy to cause the aggregate gradation in the asphalt during the milling process (the appearance of whitish material). The overall temperature of the recycled material is only about 120 ° C, and the direct paving temperature is too low, which affects the regeneration quality. Infrared heating or hot air heating raises the secondary temperature of the recycled materials. The heating temperature should not be accurately controlled, which may cause secondary aging of the recycled materials and affect the quality of the recycled materials.

(4) The high-temperature pavement heating and hot milling links have a large amount of smoke and dust leakage and pollute the environment. In-situ thermal regeneration units on the market lack the measures to recover and treat the flue gas and dust in the high-temperature pavement heating and hot milling, and their emissions are not up to standard, and they cannot meet the relevant national environmental protection laws and regulations.

(5) It is difficult to add new materials, and the heat loss is large. The remixing regenerator frequently operates intermittently, affecting the quality of regeneration. At present, the addition of new asphalt mixtures is mostly completed by transfer dump trucks, and the pavement with a thickness of 200 mm to 300 mm is raised after the road heating and milling. Before the transfer dump truck is charged, multiple road heating machines and heating milling machines need to Move 20m ~ 30m forward, then transfer the dump truck and then cross the thick material pile, riding on the material pile to feed the hopper of the remixing regenerator, causing the remixing regenerator to stop working frequently. The material pile is driven out, and then multiple heating machines and heating milling machines are moved back to their original positions and resumed operations. This feeding process has the disadvantages of difficult feeding, long interval, large heat loss, and poor regeneration flatness.

Summary of the Invention

Aiming at the above problems, the present invention proposes a layered hot milling equipment, a hot air microwave composite in-situ thermal regeneration complete unit and a layered construction method thereof, which adopts in-situ hot air layered heating, layered hot milling, and layered conveyance of asphalt pavement. The heating process realizes semi-closed low-temperature construction, which reduces energy consumption and improves construction efficiency. At the same time, the new modular hot air variable power heating and 2.45GHz frequency microwave composite heating technology are used to achieve non-destructive uniform and efficient heating of the asphalt material and restore the asphalt road. Performance, smoke-free and environmentally friendly, moderate heating depth, small inter-layer temperature gradient, non-gradation failure of thermal milling, asphalt material temperature in all links, and high construction quality; the addition of new materials adopts a combination of dump trucks and multi-functional feeders Method to achieve multi-degree of freedom and multi-directional feeding, accurate and continuous feeding, and low temperature drop of asphalt material; the unique remixing and regenerating machine adopts double screed and double screed design, which can realize a new type of remixing and paving Recycling process, taking into account the upper layer and middle layer, and adding and remixing the recycling process at the same time, realizing double-layer paving and improving the asphalt pavement. Regeneration quality.

To achieve the above technical objectives and achieve the above technical effects, the present invention is achieved through the following technical solutions:

In a first aspect, the present invention provides a layered thermal milling device, including: sequentially setting a hot air heater, a front milling heater, and a rear milling heater;

The hot air heater is used for heating old asphalt pavement;

The front milling heating machine includes a front milling heating machine body, a front milling device is provided at a front portion of the front milling heating machine body, and a first An inclined scraper feeding unit and a first horizontal scraper feeding and heating unit; a heating element is arranged below the first horizontal scraper feeding and heating unit;

The rear milling heating machine includes a rear milling heating machine body, and a second inclined scraper lifting unit is provided at the front of the rear milling heating machine body. A second horizontal scraper feeding and heating unit is provided at the rear of the second horizontal scraper feeding and heating unit; a heating device is arranged below the second horizontal scraper feeding and heating unit; a rear milling device is arranged at the rear of the body of the rear milling heating machine.

In a second aspect, the present invention provides a hot-air microwave composite in-situ thermal regeneration unit, including:

The layered thermal milling device described in the first aspect;

A microwave tunnel heater, which is located behind the rear milling heater in the layered thermal milling equipment and is used to heat the material output from the layered thermal milling equipment, which includes:

Microwave tunnel heating machine body;

A third inclined squeegee lifting device, the third inclined squeegee lifting device is disposed below the foremost part of the body of the microwave heating machine;

A tunnel-type horizontal feeding unit including a closed cavity, a distributor, a microwave heating unit, and a feeding assembly. The closed space is provided with an inlet at the top and an outlet at the bottom; the distributor The microwave heating unit is provided at the entrance of the top of the confined space and above the entrance of the conveying assembly; the microwave heating unit is provided at the top of the confined space and is above the conveying assembly; The exit end is located above the exit at the bottom of the enclosed space.

Preferably, the tunnel-type horizontal feeding unit further includes a first suppressor and a second suppressor, and the first suppressor and the second suppressor are respectively disposed at the entrance and the exit of the closed space for preventing Microwave leaks.

Preferably, the front milling heating machine body is provided with a first hot asphalt spraying unit, a first regenerant spraying unit and a first flue gas recovery processing device; the first hot asphalt spraying unit and the first regenerant The spraying unit is respectively used to spray hot asphalt and regenerant onto the upper layer of the old asphalt pavement; the first flue gas recovery processing device is close to the front milling device and is used to recover the front milling heating machine during the milling process Smoke produced in

The rear milling heating machine body is provided with a second hot asphalt spraying unit, a second regenerant spraying unit and a second flue gas recovery processing device; the second hot asphalt spraying unit and the second regenerant spraying unit are respectively It is used for spraying hot asphalt and regenerant on the middle layer of old asphalt pavement; the second flue gas recovery processing device is close to the rear milling device, and is used for recycling the rear milling heater generated during the milling process. Smoke.

Preferably, the hot-air microwave composite in-situ thermal regeneration unit further includes a feeder; the feeder includes a feeder body, and a first hopper is provided at a front portion of the feeder body, and the first hopper exits There is a material conveying and raising device for realizing the conveying and raising. The end of the material conveying and raising device far from the first hopper is provided with a slewing bearing assembly, and the slewing bearing assembly is hinged with a slewing bearing assembly. Feeding device, the rotary feeding device is connected with the cab through a luffing cylinder;

Under the action of the slewing bearing assembly, the slewing feed device realizes 90 ° left and right rotations about its rotation center with the slewing bearing assembly;

Under the action of the luffing cylinder, the swivel feeding device realizes the luffing adjustment of 0-35 ° up and down relative to its connection point with the slewing bearing assembly.

Preferably, the hot-air microwave composite in-situ thermal regeneration unit further includes a remixer, a front of the remixer is provided with a second hopper, and a bottom of the second hopper is provided with a scraper conveying and metering device. A fourth inclined scraper feeding device is provided at the end of the scraper conveying and metering device. A first thermal connection heating wall is provided between the lower two bridges of the fourth inclined scraper feeding device. A first agitator is provided above the end.

Preferably, the hot-air microwave composite in-situ thermal regeneration unit further includes a remixing regenerator; the remixing regenerator is located directly behind the feeder or diagonally behind the adjacent left and right lanes, and includes the remixing regenerator body. A second agitator is provided at the front of the remixing and regeneration machine body, and a second heat connection heating wall is provided opposite to the left and right sides of the second agitator, and a plurality of microwave heating walls are provided behind the second agitator. The rear end of the body of the remixing and regenerating machine is sequentially provided with a first cloth spiral and a first screed, and a second cloth spiral and a second screed are sequentially provided behind the first screed to remix and regenerate A horizontal conveying device is provided between the left and right support beams of the machine body. The horizontal conveying device extends forwardly and is connected with a transition hopper, and extends backwards and is connected with a feed trough. The level between the transitional hopper and the second agitator is horizontal. The feeding floor of the feeding device is provided with an automatic opening discharge door.

In a third aspect, the present invention provides a hot-air microwave composite in-situ thermal regeneration unit with a refilling and mixing method, including:

In step S11, the hot asphalt heater is used to heat the old asphalt pavement. The heating depth of the old asphalt pavement is a set first depth range value. The maximum temperature of the old asphalt pavement surface is less than or equal to the set first temperature threshold. The temperature at the first depth range value is greater than or equal to a set second temperature threshold;

Step S12: spray the regeneration agent and hot asphalt on the heated old asphalt pavement by using a front milling heater, and then perform hot milling on the old asphalt pavement within a first depth range by using a front milling device to form a regeneration Material, the temperature of the recycled material pile is greater than or equal to the third set temperature threshold, and the material is fed to the first horizontal scraper feeding and heating unit through the first inclined scraper feeding unit, and then conveyed and heated to maintain the temperature. One layer of pavement heating and milling operation; then the heating element under the front milling heating machine body is used to continue heating the old asphalt pavement below the first depth range;

In step S13, the second inclined scraper feeding device in the rear milling heating machine is used to feed the material to the second horizontal scraper conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is continuously conveyed backward and heated for heat preservation. ; The heating element under the body of the rear milling heating machine is used to continue heating the old asphalt pavement below the first depth range, and the maximum surface temperature is controlled to be less than or equal to the set first temperature threshold, and the temperature at the second depth range in the pavement. Greater than or equal to the set second temperature threshold; spraying regenerant and hot asphalt on the second layer of pavement in the second depth range, and using a rear milling device to thermally mill the old asphalt pavement in the second depth range To form a recycled material pile, and at the same time, the second horizontal scraper conveying and heating unit transports the recycled material formed by the first layer of road surface to the recycled material pile to form a recycled material pile mixture, and the comprehensive temperature of the recycled material pile mixture Greater than or equal to setting a third temperature threshold;

In step S14, the third inclined scraper feeding device in the microwave tunnel heating machine is used to feed the material to the tunnel-type horizontal conveying device for backward transportation, and the microwave heating unit is used to emit microwaves to perform secondary heating on the recycled material pile mixture. The comprehensive temperature of the heated recycled material pile mixture is greater than or equal to the fourth temperature threshold;

Step S15: Use a feeder to add a new asphalt mixture to the reclaimed material pile mixture of the microwave tunnel heater, or add a new asphalt mixture to the transition hopper of the remixing regenerator, and pass the Open and close control the new asphalt mixture to enter the second mixer; use the remixing regenerator to complete the mixing of the recycled material pile mixture and the new asphalt mixture to form a mixed material pile. When the temperature of the mixed material pile is lower than When the fifth temperature threshold is set, the second microwave heating wall is used to emit microwaves to supplement the temperature of the mixing pile. After heating, the average temperature of the mixing pile is less than or greater than the fifth temperature threshold, and the second mixer is used. The left and right sides are provided with second thermal connection heating walls to heat the thermal bonding of the milled asphalt pavement. The heating temperature is greater than or equal to the sixth temperature threshold. The flat screed is lifted, and the secondary cloth spiral and the secondary foundation paving screed are used to complete the cloth and pre-press, and finally compacted to obtain a recycled asphalt pavement;

Or use a dump truck to directly add new asphalt mixture to the second hopper of the remixer, and complete the metering and transportation of the new asphalt mixture to the recycled material pile through the scraper conveying and metering device. The fourth inclined scraper lifting unit will Recycled material and new asphalt mixture are continuously conveyed to the first overhead mixer, which is fully mixed to form a material pile. The first thermally connected heating wall heats the thermally bonded asphalt pavement after milling, and the temperature is not lower than the sixth temperature threshold. , Using an independent paver to complete the cloth, paving, and finally compaction compaction to get recycled asphalt pavement.

In a fourth aspect, the present invention provides a hot-air microwave composite in-situ thermal regeneration unit with a method of recharging, mixing and paving, which is characterized by:

Step S21, which is the same as Step S11;

Step S22, which is the same as step S12;

Step S23, which is the same as step S13;

Step S24, which is the same as Step S14;

Step S25, using the feeder to drive the regeneration lane and the left and right side lanes to complete the addition of the new asphalt mixture in the regeneration pile and the transition hopper in the remixing regeneration machine, one of which is continuously raised after milling. The new asphalt mixture is directly added to the recycled material pile, and another one is continuously added to the transition hopper in the remixing regeneration machine, and the new asphalt mixture is controlled to be transported backward by the horizontal conveying device;

In step S26, the re-mixing regeneration machine is used to complete the re-mixing regeneration and surface surfacing at the same time. The re-mixing regeneration means that the feeder conveys the new asphalt mixture to the reclaimed material pile after milling, The mixer completes the mixing of the two uniformly and forms a mixing stockpile. When the temperature of the mixing stockpile is lower than the set fourth temperature threshold, a microwave heating wall is used to emit microwaves to re-mix the mixing stockpile after the remixing. Temperature supplement heating, the second thermal connection heating wall on both sides heat-bonds the milled asphalt pavement, and the mixing pile is pre-compressed by a first-level cloth spiral and a first-level screed to form a re-mixed regeneration layer. The surface paving is when the feeder conveys the new asphalt mixture to the transition hopper, and the new asphalt mixture is controlled by the horizontal conveying device to slide back to the re-mixed regeneration layer, and is spread by the secondary cloth spiral and the secondary foundation. The screed cloth and pavement are pre-pressed to form a new “hot-to-hot” new thin abrasion layer of asphalt, which is finally compacted by rolling to obtain a recycled asphalt pavement.

In a fifth aspect, the present invention provides a method for simultaneously adding and re-mixing the upper and middle layers of a hot-air microwave composite in-situ thermal regeneration unit, including: a step of adding and re-mixing the upper layer and a step of adding and re-mixing the middle layer Mixing regeneration and paving regeneration steps of the upper layer;

The step of adding, remixing and transferring the upper layer includes:

Step S31, which is the same as Step S11;

Step S32, which is the same as Step S12;

Step S33, which is the same as step S13;

Step S34, which is the same as Step S14;

Step S35, the new asphalt mixture is directly added to the second hopper of the remixer by a dump truck, and the new asphalt mixture is metered and conveyed to the reclaimed material pile through the scraper conveying and metering device, and the fourth inclined scraper is used to lift the material. The device continuously transfers the recycled material and new asphalt mixture to the first overhead mixer. The recycled material directly falls into the hopper of the multifunctional feeder. The upper layer of recycled material is completed through the functions of the feeder's rotation, amplitude, and transportation Transfer to a dump truck;

The steps of adding, remixing and regenerating the middle layer and paving and regenerating the upper layer include:

Step S36, which is the same as step S11;

Step S37, which is the same as Step S12;

Step S38, which is the same as Step S13;

Step S39, which is the same as Step S14;

Step S310, using a remixing and recycling machine to complete the resurfacing of the middle layer and paving regeneration of the upper layer at the same time. The resurfacing of the middle layer refers to the feeding machine conveying the new asphalt mixture to the recycled pile after milling. The second agitator of the remixing regeneration machine completes the mixing of the two uniformly and forms a middle-surface layer recycled material pile. When the temperature of the middle-surface layer recycled material pile is less than a set fourth threshold, a microwave heating wall is used to emit The microwave reheats and reheats the middle layer recycled material pile. The second thermal connection heating wall on both sides heats the asphalt pavement after milling, and the middle layer recycled material passes the first-level cloth spiral and the first-level ironing. The flat paving is pre-pressed to form a new mid-level layer. The upper-layer paving regeneration refers to the feeding machine conveying the upper-layer recycled material to the transition hopper, and then transported by the horizontal conveying device to the rear surface and slide down to the mid-level layer. The first-level cloth spiral and the second-level foundation paving screed are pre-compressed to form a new top layer of "heat-to-heat", which is finally compacted by rolling to obtain a recycled asphalt pavement.

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

1) The hot air heater adopts new modular variable power hot air heating technology. The temperature of the hot air inlet and return air is accurately controlled through the modularization of several heaters. The maximum temperature of the asphalt pavement surface does not exceed 180 ° C, and the temperature within the road surface is 20mm ～ 30mm. Not lower than 110 ℃, which solves the problems of traditional oil / gas open flame heating, gas infrared heating or extensive high-power diesel hot air heating of easily burnt asphalt pavement, which causes environmental pollution and degradation of road performance. Recycling of waste heat effectively reduces heat leakage around the equipment and avoids high temperature hot smoke around the construction, which can easily lead to green belts and tree charring;

2) The front milling heater and the rear milling heater adopt the construction technology of in-situ hot air layer heating, layered thermal milling, layered conveyance and heating of asphalt pavement, which solves the problem of in-situ thermal regeneration units on the market. Asphalt pavement is heated at one time, the temperature gradient between layers is large, the temperature of the upper 10mm ～ 20mm thick asphalt material is too high (up to 240 ℃), the depth is mostly limited to 30mm ～ 40mm depth, the deep layer of the disease cannot be treated well, the bottom asphalt The material temperature is only 70 ℃ ～ 80 ℃, which easily causes the aggregate gradation in the asphalt material during the milling process (the appearance of blooming materials). The overall temperature of the recycled material is only about 120 ℃, and the direct paving temperature is too low, which affects the regeneration. Quality problems have achieved semi-enclosed low-temperature construction, reducing energy consumption and improving construction efficiency. In addition, high-temperature pavement heating and thermal milling have introduced a flue gas recovery and treatment device to effectively suppress the emission of flue gas dust and meet the national requirements. Relevant environmental laws and regulations.

3) The microwave tunnel heater uses the tunnel microwave heating technology, and uses the 2.45GHz frequency microwave to re-heat the layered and milled recycled materials to achieve non-destructive uniform and efficient heating of the asphalt material to ensure that the asphalt material temperature in each link reaches the standard. Restored asphalt road performance, smokeless and environmentally friendly. Overcome the shortcomings of in-situ thermal regeneration units that use infrared heating or hot air heating on the market, which is not suitable for precise control, which is likely to cause secondary aging of recycled materials and affect the quality of regeneration;

4) The introduction of the dumper + multi-functional feeder adding combination can realize the multi-degree of freedom and multi-directional feeding of the rotation of the conveying device and any area within the variable range, accurate feeding, and small loss of asphalt temperature drop. It solves the problems of difficulty in adding existing new materials, large heat loss, frequent intermittent operation of the remixing and regenerating machine during the feeding process, poor construction flatness, and poor regeneration quality;

5) The remixing and regenerating machine adopts 2.45GHz frequency microwave + modular hot air heating method, respectively, to achieve selective reheating and heating of the asphalt pile piled up after remixing and thermal bonding heating of the asphalt pavement after milling. The smoke is environmentally friendly, ensuring that the temperature of the asphalt material reaches the standard in each link, and the double screed and double screed design can realize a new process of adding, remixing, and paving. The technology realizes the real double-layer paving and improves the regeneration quality of asphalt pavement.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a re-mixing and regenerating construction process (recharging in a regeneration lane) of the present invention;

FIG. 2 is a schematic diagram of a refilling and mixing construction process (sideway lane feeding) according to the present invention; FIG.

FIG. 3 is a schematic diagram of an additive remixing construction process (independent paving) according to the present invention; FIG.

FIG. 4 is a schematic diagram of the regenerating construction process of adding and remixing and adding paving according to the present invention (simultaneous charging of the regeneration lane and the side lane);

FIG. 5 is a schematic diagram of the construction process of the upper layer and the middle layer of the present invention with simultaneous addition and remixing;

Figure 6 is a structural layout diagram of a hot-air heater;

7 is a structural layout diagram of a front milling heating machine;

8 is a structural layout diagram of a rear milling heating machine;

9 is a structural layout diagram of a microwave tunnel heater;

FIG. 10 is a structural layout diagram of a loading combination of a dump truck and a multifunctional feeder;

FIG. 11 is a schematic view of a luffing operation state of the multifunctional feeder;

FIG. 12 is a schematic view of a rotary operation state of the multifunctional feeder;

Figure 13 is a structural layout diagram of the mixer;

FIG. 14 is a structural layout diagram of the remixing regenerator.

In the picture:

1. Hot air heater, 1-1, first hot air heating wall, 1-2, front and rear heating wall lifting frame, 1-3, middle heating wall lifting frame, 2, front milling heating machine, 2-1, Front milling device, 2-2, first inclined scraper feeding device, 2-3, first horizontal scraper feeding and heating device, 2-4, second hot air heating wall, 2-5, first heat Asphalt tank, 2-6, first regenerant tank, 2-7, first flue gas recovery processing device, 3, rear milling heater, 3-1, rear milling device, 3-2, second Inclined scraper feeding device, 3-3, second horizontal scraper conveying heating device, 3-4, third hot air heating wall, 3-5, second flue gas recovery processing device, 3-6, second heat Asphalt tank, 3-7, second regenerant tank, 4, microwave tunnel heater, 4-1, third inclined scraper lifting device, 4-2, tunnel type horizontal feeding device, 4-3, distributor , 4-4, first suppressor, 4-5, microwave heating unit, 4-6, second suppressor, 4-7, microwave variable frequency power supply, 4-8, microwave heat sink, 4-9, insulation board, 5. Dump truck + multi-functional feeder feeding combination, 5-1, feeder, 5-1-1, the first hopper, 5- 1-2, feeding and feeding device, 5-1-3, slewing bearing assembly, 5-1-4, slewing feeding device, 5-1-5, cab, 5-1-6, luffing cylinder , 5-2, Dump truck, 6, Remixer, 6-1, Second hopper, 6-2, Scraper conveying metering device, 6-3, Fourth inclined scraper lifting device, 6-4, First thermal connection heating wall, 6-5, first mixer, 7, remixing regenerator, 7-1, second mixer, 7-2, second thermal connection heating wall, 7-3, microwave heating wall , 7-4, primary cloth spiral, 7-5, primary leveling screed, 7-6, secondary cloth spiral, 7-7, secondary foundation paving screed, 7-8, horizontal feeding device , 7-9, Transition hopper, 7-10, Feeding trough, 7-11, Discharge door, 8, Paver, α, Multi-functional feeder feeding angle, β, Multi-functional feeder rotation Material angle.

detailed description

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below in combination with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

The application principle of the present invention is described in detail below with reference to the drawings.

Example 1

An embodiment of the present invention provides a layered thermal milling device, which includes: sequentially setting a hot air heater 1, a front milling heater 2, a rear milling heater 3;

In order to overcome the traditional fuel / gas open flame heating, gas infrared heating or extensive high-power diesel hot air heating, easy to scorch asphalt pavement, cause environmental pollution and road performance degradation, and effectively avoid high temperature hot smoke around the construction, which can easily lead to green belts and trees. The problem of scorching, this embodiment adopts a new type of modular variable power hot air heating technology. The temperature of the hot air inlet and return air is accurately controlled through the modularization of several heaters. The maximum temperature of the asphalt pavement surface does not exceed 180 ° C, and the road surface is 20mm to 30mm. The temperature at the place is not lower than 110 ℃, the heating process is smoke-free and environmentally friendly, and the thermal efficiency is high. At the same time, the waste heat around the modular heating wall is recycled to effectively reduce the heat leakage around the equipment. The specific structure of the hot-air heater in this embodiment is described in detail below.

As shown in FIG. 1 to FIG. 6, the hot air heater 1 in the embodiment of the present invention is located at the forefront of the in-situ thermal regeneration equipment and is used for heating the old asphalt pavement. The hot air heater includes a hot air heater body and at least three groups of first hot air heaters. Wall 1-1, each first hot air heating wall 1-1 is located in front, middle and rear of the hot air heating machine body respectively, through two groups of front and rear heating wall lifting frames 1-2 and one group of intermediate heating wall lifting frames 1-3 Connected to the body. The present invention does not limit the specific number of hot-air heaters 1. The hot-air heater 1 may use CN108086123A, and the invention name is a modularized zoned hot-air circulation type asphalt pavement heater mentioned in the modularized zoned hot-air circulation type. Asphalt pavement heater; the first hot-air heating wall adopts the heating wall structure mentioned in the Chinese invention patent application with publication number CN108487020A and the invention name is a hot-air circulation heating device; The lifting frame adopts the heating wall operation execution mechanism mentioned in the Chinese invention patent application with a public number of CN108560389A and an invention name of a heating wall operation execution mechanism and its asphalt pavement heater.

In order to solve the problem that the in-situ thermal regeneration equipment on the market adopts one-time heating of asphalt pavement, the temperature gradient between layers is large, the temperature of the asphalt material with a thickness of 10mm to 20mm is too high (up to 240 ° C), and the depth is mostly limited to a depth of 30mm to 40mm. Without good treatment, the temperature of the bottom asphalt material is only 70 ℃ ～ 80 ℃, which easily causes the aggregate gradation in the asphalt material during the milling process (the appearance of blooming material), and the comprehensive temperature of the recycled material is only about 120 ℃. The direct paving temperature is too low, which affects the problem of regeneration quality. The front milling heater and the rear milling heater use in-situ hot-air layered heating, layered thermal milling, layered conveyance and heating on the asphalt pavement. , Realized semi-enclosed low-temperature construction, reduced energy consumption and improved construction efficiency; in addition, the high-temperature pavement heating and thermal milling link introduced a flue gas recovery and treatment device, which effectively suppressed the emission of flue gas dust and met relevant national environmental protection laws Regulatory requirements. Its specific structure is described in detail below.

As shown in FIG. 7, the front milling heating machine 2 includes a front milling heating machine body, and a front milling device 2-1 is provided below the front part of the front milling heating machine body, for The old asphalt pavement is hot-milled, which is a device in the prior art. The front milling device 2-1 is sequentially provided with a first inclined scraper lifting device 2-2 and a first horizontal scraper. Plate conveying heating device 2-3, at least two sets of second hot air heating wall 2-4 are arranged between the two bridges below the first horizontal scraper conveying heating device 2-3, and the upper part of the front milling heating machine body The front end is provided with a first hot asphalt tank 2-5 and a first regenerant tank 2-6 which are symmetrically arranged left and right, and a first flue gas recovery processing device 2-7 is set in the middle of the upper part of the front milling heating machine body; The second hot air heating wall uses the heating wall structure mentioned in the Chinese invention patent application with publication number CN108487020A and the invention name being a hot air circulation heating device.

As shown in FIG. 8, the rear milling heating machine 3 includes a rear milling heating machine body. A milling device 3-1 is provided below the rear end of the rear milling heating machine body, and the rear milling heating machine body is at the front. A second tilting scraper lifting device 3-2 is provided below the second tilting scraper lifting device 3-2, and a second horizontal scraper feeding and heating device 3-3 is arranged at the rear, the second level At least two sets of third hot air heating walls 3-4 are arranged between the front and rear bridges under the scraper conveying heating device 3-3. The rear milling heating machine body is located at the rear of the third hot air heating walls 3-4. The uppermost part of the upper part is provided with a second flue gas recovery processing device 3-5, and the front part of the second flue gas recovery processing device 3-5 is provided with a second hot asphalt tank 3-6 and a second regeneration which are symmetrically arranged left and right. The third hot air heating wall uses the heating wall structure mentioned in the Chinese invention patent application with publication number CN108487020A and the invention name being a hot air circulation heating device.

Example 2

Based on the same inventive concept as Embodiment 1, the embodiment of the present invention provides a hot-air microwave composite in-situ thermal regeneration unit, which can not only implement layered thermal milling, but also overcome the in-situ thermal regeneration units on the market that use infrared heating or hot air heating. The temperature should not be accurately controlled, which may cause secondary aging of the recycled materials and affect the quality of the recycled materials. The microwave tunnel heater uses the tunnel microwave heating technology and uses the 2.45 GHz frequency microwave to perform secondary heating of the recycled materials after layering and milling. To achieve non-destructive uniform and efficient heating of the asphalt pavement, to ensure that the asphalt material temperature in each link reaches the standard, and to restore the asphalt road performance, smokeless and environmentally friendly.

The hot-air microwave composite in-situ thermal regeneration unit includes:

The layered thermal milling equipment described in Example 1;

Microwave tunnel heater, which is located behind the rear milling heater in the layered thermal milling equipment and is used to heat the material output from the layered thermal milling equipment, as shown in Figure 9. The microwave tunnel heater 4 includes:

A microwave tunnel heating machine body, a third inclined scraper lifting device 4-1 is provided below the foremost part of the microwave tunnel heating machine body, and the third inclined scraper lifting device 4-1 is arranged on the microwave heating machine body The lower part of the foremost part is used to realize the feeding; the rear of the third inclined scraper feeding device 4-1 is provided with a tunnel-type horizontal feeding device 4-2, and the tunnel-type horizontal feeding device 4-2 includes A closed cavity, a distributor 4-3, several sets of microwave heating units 4-5, and a feeding assembly. The closed space is provided with an inlet at the top and an outlet at the bottom; the distributor 4-3 is provided in the closed At the entrance of the top of the space, it is located above the entrance of the conveying module for uniform left and right material distribution; the microwave heating unit 4-5 is located at the top of the closed space and above the conveying module; The outlet end of the feeding assembly is located above the bottom outlet of the closed space.

Distributors 4-3, suppressor I4-4, several sets of microwave heating units 4-5, and suppressor Ⅱ4-6 are arranged in order from the top to the bottom. Several sets of microwave variable frequency power supplies are set above and below the microwave tunnel heating machine body. 4-7 and several groups of microwave heat sinks 4-8, and several groups of insulation boards 4-9 are set under the microwave tunnel heating machine body.

Further, in order to prevent leakage of microwaves, that is, lack of load of the microwave heating unit, the tunnel-type horizontal feeding device further includes a first suppressor 4-4 and a second suppressor 4-6, the first suppressor 4 -4 and the second suppressor 4-6 are respectively provided at the entrance and the exit of the enclosed space. The first suppressor 4-4 and the second suppressor 4-6 may use a reactive leakage suppressor. The suppressor is filled with mineral powder, cement, sand, aluminum profiles, etc., and is used to absorb leakage at both ends of the inlet and outlet. Microwave energy, the microwave energy generated by the microwave heating unit is confined within the tunnel-type closed cavity. The microwave heating unit includes a magnetron and a waveguide antenna. The magnetron is used to transmit microwave energy at a frequency of 2.45 GHz, and the waveguide antenna is used to transmit microwave energy. The structure of the microblog heating unit is the prior art.

Further, in order to solve the existing addition of new asphalt mixtures, it is necessary to lift a 200mm to 300mm thick pile after milling, which has hidden safety hazards. In addition, the road heating machine and heating milling machine need to move forward 20m when adding materials. ～ 30m, the problem of large heat loss of the milling material due to the large span, and the hopper feeding on the material pile to the remixing regenerator will inevitably cause the remixing regenerator to stop working frequently, affecting the smoothness and regeneration of the paving. The problem of poor quality control, the present invention also proposes a dump truck + multi-functional feeder adding material combination 5, which includes a feeder 5-1 and a dump truck 5-2; it can realize the rotation and change of the conveying device. Multi-degree of freedom and multi-directional feeding in any area within the width range, accurate feeding, small loss of asphalt temperature drop, and continuous and efficient operation of the remixing and regenerating machine. Its specific structure is described in detail below.

As shown in FIGS. 10 to 12, the feeder 5 is located directly in front of the regenerator 7 or diagonally in front of the adjacent left and right lanes, and includes the feeder 5-1. The front of the feeder 5-1 The department is equipped with the first hopper 5-1-1, and the feeding and lifting device 5-1-2 is located at the bottom of the first hopper 5-1-1. It is used to realize the first feeding and then the feeding. The feeding and feeding device 5 The end of -1-2 is fixed to the slewing bearing assembly 5-1-3, and the slewing feed device 5-1-4 is hinged to the slewing bearing assembly 5-1-3 and communicates with the driver through the luffing cylinder 5-1-6 The chamber 5-1-5 is connected, and under the action of the slewing bearing assembly 5-1-3, the slewing feed device 5-1-4 realizes left and right around the slewing center of the slewing bearing assembly 5-1-3 With 90 ° rotation, under the action of the amplitude-changing cylinder 5-1-6, the rotary feeding device 5-1-4 achieves a vertical 0-35 ° change relative to its connection point with the rotary bearing assembly 5-1-3. Width adjustment.

In order to improve the adaptability of the construction technology of in-situ thermal regeneration units, to overcome the market, the units can only implement the re-mixing regeneration process and the re-mixing and laying-up process. Neither the upper layer and the middle layer can be regenerated in-situ at the same time. The re-mixing process of the paving process does not add a certain proportion of new asphalt mixture, and by adding an appropriate amount of regenerant, the re-spreading paves to form a regeneration layer, and then a new thickness of a new asphalt mixture is laid on the regeneration layer, and The problem of double-layer paving without real meaning and poor construction quality is not achieved. The embodiment of the present invention proposes to adopt the 2.45GHz frequency microwave + modular hot air heating method to respectively realize selective reheating and temperature increase of the asphalt pile piled up after remixing. As well as the thermal bonding heating of the asphalt pavement after milling, the heating is smoke-free and environmentally friendly, ensuring that the asphalt material temperature in each link reaches the standard, and the double screed and double screed design can realize a brand-new additive remixing and paving regeneration process. At the same time, the upper layer and the middle layer are added and remixed at the same time to realize the double-layer paving, which improves the regeneration quality of the asphalt pavement. Therefore, in the embodiment of the present invention, the hot-air microwave composite in-situ thermal regeneration unit further includes a remixer 6 or a remixer 7. The specific structures of the remixer 6 and the remixer 7 are described in detail below. .

As shown in FIG. 13, a second hopper 6-1 is provided at the foremost part of the compounder 6, and a scraper conveying and metering device 6-2 and a scraper-conveying and metering device 6-6 are provided at the bottom of the second hopper 6-1. The end of 2 is provided with a fourth inclined scraper lifting device 6-3, and a first thermal connection heating wall 6-4 is arranged between the lower front and rear bridges of the fourth inclined scraper lifting device 6-3, above the mixer body The first stirrer 6-5 is set at the end.

As shown in FIG. 14, a second agitator 7-1 is provided at the lowermost front part of the remixing regeneration machine 7, and a second thermal connection heating wall 7-2 is provided on the left and right sides of the second agitator 7-1. There are several sets of microwave heating walls 7-3 between the two tracks on the back of the two mixers 7-1, and there is a first-level cloth spiral 7-4 and a first-level screed 7-5 below the rear end of the remixing machine body. A secondary cloth spiral 7-6 and a secondary foundation paving screed 7-7 are also provided behind the primary leveling screed 7-5. The front end of the body is provided with a horizontal feeding device 7- 8. The horizontal conveying device 7-8 extends forwardly and is connected with a transition hopper 7-9, and the rearward extension is connected with a lead tank 7-10. The horizontal conveying device is between the transition hopper 7-9 and the second mixer 7-1. A discharge door 7-11 is automatically opened on the conveying bottom plate of 7-8; the first described in this embodiment

To sum up: when using the hot air microwave composite in-situ thermal regeneration complete set unit that uses the layered construction proposed in the embodiment of the present invention to perform the construction, it can carry out the process including adding and remixing regeneration, adding and remixing overlay regeneration process, and The middle surface layer is simultaneously added with three kinds of mixing and regeneration processes.

Example 3

Based on the same inventive concept as Embodiment 2, an embodiment of the present invention provides a method for re-mixing and regenerating materials. Referring to FIG. 1 to FIG. 3, the process for re-mixing and regenerating materials includes the following steps:

In step S11, the hot asphalt heater 1 is used to heat the old asphalt pavement. The heating depth of the old asphalt pavement is 20mm ~ 30mm, the maximum temperature of the surface of the old asphalt pavement does not exceed 180 ° C, and the temperature in the pavement at 20mm ~ 30mm is not lower than 110. ℃

In step S12, the front milling heater 2 is used to accurately spray the regenerant and hot asphalt before the hot milling, and then the front milling device 2-1 performs hot milling on the old asphalt pavement 20mm to 30mm. The milling process is introduced The first flue gas recovery processing device 2-7 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed, and the temperature of the pile is not lower than 140 ° C. The material is conveyed to the first horizontal scraper conveying and heating device 2-3 and transported and heat-retained to complete the heating and milling of the first layer of 20mm ～ 30mm pavement; then the second hot air heating wall 2-4 under the machine continues Heating asphalt pavement below 20mm ～ 30mm;

Step S13, using the front second inclined scraper lifting device 3-2 of the rear milling heater 3 to lift the material to the second horizontal scraper conveying heating device 3-3, and continue to pave the first layer of 20mm-30mm road surface. The formed recycled material is transported backwards and heated for heat preservation; the third hot air heating wall 3-4 under the body is used to continue heating the asphalt pavement below 20mm to 30mm, and the maximum temperature of the surface layer is not to exceed 180 ° C. The temperature is not lower than 110 ℃; the road surface is accurately sprayed with regenerant and hot asphalt before the second layer of hot milling, and the rear milling device 3-1 performs hot milling on the old asphalt road 40mm ～ 60mm. The flue gas recovery processing device 3-5 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed. At the same time, the second horizontal scraper conveying and heating device 3-3 regenerates the first layer of 20mm-30mm pavement. The material is sent to the recycled material pile, and the comprehensive temperature of the recycled material pile is not less than 140 ° C;

In step S14, the front third inclined scraper lifting device 4-1 of the microwave tunnel heater 4 is used to feed the material to the tunnel-type horizontal conveying device 4-2 and conveyed backward, and the microwave heating unit 4-5 is used to emit a 2.45 GHz microwave. Reheat the recycled material, raise the temperature by 10 ℃ ～ 15 ℃, and the comprehensive temperature of the recycled material pile after heating is not lower than 150 ℃;

Step S15, use a set of dump truck + multi-functional feeder adding combination 5 to drive in the regeneration lane or left and right side lanes, and continuously add new asphalt mixture directly to the reclaimed material pile after milling, or continuously Add new asphalt mixture to the transition hopper 7-9 of the remixing regeneration machine 7, and accurately control the new asphalt mixture to enter the second mixer 7-1 through the opening and closing of the discharge door 7-11;

In step S16, the remixing and regenerating machine 7 is used to complete the mixing of the recycled materials and the new asphalt mixture to form a trapezoidal ridge-shaped mixing pile. The temperature of the forming pile is generally not lower than 150 ° C, and microwave heating can be selectively used. Wall 7-3 emits a 2.45GHz microwave to re-warm the mixed material pile after recombination. After heating, the average temperature of the material pile is not less than 160 ° C. The second thermal connection on both sides of the heating wall 7-2 pairs of milling. The thermal bonding heating of the asphalt pavement after planing, the temperature is not lower than 120 ° C (that is, the original pavement formed after two milling operations needs to be heated to 120 degrees before paving, so that the recycled material and the original pavement can be ensured when paving. (The joint strength increases), the first-level cloth spiral 7-4 and the first-level screed 7-5 are lifted when paving, and the second-level cloth spiral 7-6 and the second-level basic paving screed 7-7 complete the cloth 3. Paving pre-pressing, and finally compaction by rolling to get recycled asphalt pavement;

Instead of steps S15 and S16, it is also possible to use a dump truck to directly add new asphalt mixture to the second hopper 6-1 of the remixer 6, and complete the metering and conveying of the new asphalt mixture to the second hopper 6-1 of the scraper conveyor 6-2. On the recycled material pile, the fourth inclined scraper lifting device 6-3 continuously transfers the recycled material and the new asphalt mixture to the first overhead mixer 6-5, and fully mix and form the material pile temperature not lower than 150 ° C. The first thermal connection heating wall 6-4 heat-bonds the asphalt pavement after milling, the temperature is not lower than 120 ° C, and the independent paver 8 is used to complete the distribution and paving. Finally, it is compacted to obtain a recycled asphalt pavement. .

Example 4

An embodiment of the present invention provides a regeneration, remixing, and overlaying regeneration process. As shown in FIG. 4, the regeneration, remixing, and overlaying regeneration process includes the following steps:

In step S21, the hot asphalt heater 1 is used to heat the old asphalt pavement. The heating depth of the asphalt pavement is 20mm to 30mm. The maximum temperature of the surface of the old asphalt pavement does not exceed 180 ° C, and the temperature at the 20mm to 30mm inside the road is not lower than 110 ° C. ;

Step S22, the front milling heater 2 is used to accurately spray the regenerant and hot asphalt before the hot milling, and then the front milling device 2-1 performs hot milling on the old asphalt pavement 20 mm to 30 mm. The milling process is introduced The first flue gas recovery processing device 2-7 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed, and the temperature of the pile is not lower than 140 ° C. The material is conveyed to the first horizontal scraper conveying and heating device 2-3 and transported and heat-retained to complete the heating and milling of the first layer of 20mm ～ 30mm pavement; then the second hot air heating wall 2-4 under the machine continues Heating asphalt pavement below 20mm ～ 30mm;

In step S23, the front tilting scraper lifting device 3-2 of the rear milling heater 3 is used to pick up the material to the second horizontal scraper feeding and heating device 3-3, and the first layer of 20 mm to 30 mm road surface is continued. The formed recycled material is transported backwards and heated for heat preservation; the third hot air heating wall 3-4 under the body is used to continue heating the asphalt pavement below 20mm to 30mm, and the maximum temperature of the surface layer is not to exceed 180 ° C. The temperature is not lower than 110 ℃; the road surface is accurately sprayed with regenerant and hot asphalt before the second layer of hot milling, and the rear milling device 3-1 performs hot milling on the old asphalt road 40mm ～ 60mm. The flue gas recovery processing device 3-5 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed. At the same time, the second horizontal scraper conveying and heating device 3-3 regenerates the first layer of 20mm-30mm pavement. The material is sent to the recycled material pile, and the comprehensive temperature of the recycled material pile is not less than 140 ° C;

In step S24, the front third inclined scraper lifting device 4-1 of the microwave tunnel heater 4 is used to feed the material to the tunnel horizontal conveying device 4-2, and the microwave heating unit 4-5 is used to emit a 2.45 GHz microwave. Reheat the recycled material, raise the temperature by 10 ℃ ～ 15 ℃, and the comprehensive temperature of the recycled material pile after heating is not lower than 150 ℃;

Step S25, using several sets of dump trucks + multi-functional feeder adding combination 5 driving in the regeneration lane and left and right side lanes to complete the addition of the new asphalt mixture at two locations, one of which is continuously raised after milling New asphalt mixture is directly added to the recycled material pile, and the other place continuously adds new asphalt mixture to the transition hopper 7-9 of the remixing regeneration machine 7, which is then precisely controlled by the horizontal conveying device 7-8 in the feeder The new asphalt mixture is transported backward; that is, as shown in Figure 4, the remixing and paving process uses two sets of feed combinations, and the side lane feeder directly adds a certain proportion of new materials to the reclaimed material pile formed on the original pavement, which is recycled. The lane feeder adds new material to the hopper and conveys it back to the second screed paving through the horizontal conveying device at the bottom of the hopper. The two new materials have different gradations. The former is a new material with larger particles for remixing. It is a new material of fine particles on the surface abrasion layer;

In step S26, the re-mixing regeneration machine 7 is used to complete the re-mixing regeneration and surface surfacing at the same time. The re-mixing regeneration refers to the dump truck + multi-functional feeder adding combination 5 to transport the new asphalt mixture to the reclaimed material after milling. The stack is completed by the second mixer 7-1 of the remixing regeneration machine 7 and the two are evenly mixed to form a trapezoidal ridge-shaped mixing pile. The temperature of the forming pile is generally not lower than 150 ° C, and microwave heating can be selectively used. Wall 7-3 emits a 2.45GHz microwave to re-warm the mixed material pile after recombination. After heating, the average temperature of the material pile is not less than 160 ° C. The second thermal connection on both sides of the heating wall 7-2 pairs of milling. The thermal bonding and heating of the asphalt pavement after planing, the temperature is not lower than 120 ° C, the mixing pile is paved and pre-pressed to form a re-mixed regeneration layer through the first-level cloth spiral 7-4 and the first-level screed 7-5. Overlaying refers to the combination of dump truck + multi-functional feeder adding material 5 to convey the new asphalt mixture to the transition hopper 7-9, and then the horizontal conveying device 7-8 accurately controls the new asphalt mixture to be transported backward and slipped to the remix On the regeneration layer, the cloth and screeds passing through the secondary cloth spiral 7-6 and the secondary foundation paving screed 7-7 After the pre-press forming "hot heat" of the new thin asphalt wearing course, the final rolling compacting, regenerated asphalt pavement.

Example 5

The embodiment of the present invention provides a method for simultaneously adding and re-mixing the upper and middle layers, including the re-mixing and transferring of the upper layer + the re-mixing and recycling of the middle layer + the paving and regeneration method of the upper layer, see FIG. 5 as follows:

The steps of the top layer remixing transfer:

In step S31, several hot air heaters 1 are used to heat the old asphalt pavement. The heating depth of the asphalt pavement is 20 mm to 30 mm. The maximum temperature of the surface of the old asphalt pavement does not exceed 180 ° C. The temperature in the pavement between 20 and 30 mm is not less than 110 ° C. ;

Step S32, the front milling heater 2 is used to accurately spray the regeneration agent and hot asphalt before the hot milling, and then the front milling device 2-1 performs hot milling on the old asphalt pavement 20mm to 30mm. The milling process is introduced The first flue gas recovery processing device 2-7 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed, and the temperature of the pile is not lower than 140 ° C. The material is conveyed to the first horizontal scraper conveying and heating device 2-3 and transported and heat-retained to complete the heating and milling of the first layer of 20mm ～ 30mm pavement; then the second hot air heating wall 2-4 under the machine continues Heating asphalt pavement below 20mm ～ 30mm;

In step S33, the front tilting scraper lifting device 3-2 of the rear milling heater 3 is used to pick up the material to the second horizontal scraper feeding and heating device 3-3, and the first layer of 20 mm to 30 mm road surface is continued. The formed recycled material is transported backwards and heated for heat preservation; the third hot air heating wall 3-4 under the body is used to continue heating the asphalt pavement below 20mm to 30mm, and the maximum temperature of the surface layer is not to exceed 180 ° C. The temperature is not lower than 110 ℃; the road surface is accurately sprayed with regenerant and hot asphalt before the second layer of hot milling, and the rear milling device 3-1 performs hot milling on the old asphalt road 40mm ～ 60mm. The flue gas recovery processing device 3-5 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed. At the same time, the second horizontal scraper conveying and heating device 3-3 regenerates the first layer of 20mm-30mm road surface. The material is sent to the recycled material pile, and the comprehensive temperature of the recycled material pile is not less than 140 ° C;

In step S34, the front third inclined scraper lifting device 4-1 of the microwave tunnel heater 4 is used to feed the material to the tunnel horizontal conveying device 4-2, and the microwave is heated by the microwave heating unit 4-5 to emit 2.45 GHz microwave. Reheat the recycled material, raise the temperature by 10 ℃ ～ 15 ℃, and the comprehensive temperature of the recycled material pile after heating is not lower than 150 ℃;

Step S35, the new asphalt mixture is added directly to the hopper Ⅱ 6-1 of the remixer 6 by using a dump truck, and the new asphalt mixture is metered and transported to the recycled material pile through the scraper conveying and metering device 6-2. The inclined scraper feeding device 6-3 continuously transfers the recycled material and the new asphalt mixture to the first overhead mixer 6-5, and fully mixes evenly to form a stockpile temperature of not less than 150 ° C. The recycled material directly falls into the multi-function The hopper of the feeder 5-1 completes the transfer of the upper layer recycled material to the dump truck through the functions of rotation, amplitude change and conveyance of the multifunctional feeder 5-1;

Steps of re-mixing and regenerating the middle layer and paving regeneration of the upper layer:

In step S36, the hot asphalt heater 1 is used to heat the old asphalt pavement. The heating depth of the asphalt pavement is 20 mm to 30 mm. The maximum temperature of the surface of the old asphalt pavement does not exceed 180 ° C, and the temperature in the road from 20 mm to 30 mm is not lower than 110 ° C. ;

Step S37, the front milling heater 2 is used to accurately spray the regenerant and hot asphalt before the hot milling, and then the front milling device 2-1 performs hot milling on the old asphalt pavement 20mm to 30mm. The milling process is introduced The first flue gas recovery processing device 2-7 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed, and the temperature of the pile is not lower than 140 ° C. The material is conveyed to the first horizontal scraper conveying and heating device 2-3 and transported and heat-retained to complete the heating and milling of the first layer of 20mm ～ 30mm pavement; then the second hot air heating wall 2-4 under the machine continues Heating asphalt pavement below 20mm ～ 30mm;

Step S38, using the front second inclined scraper lifting device 3-2 of the rear milling heating machine 3 to pick up the material to the second horizontal scraper conveying heating device 3-3, and continue to pave the first layer of 20mm-30mm road surface. The formed recycled material is transported backwards and heated for heat preservation; the third hot air heating wall 3-4 under the body is used to continue heating the asphalt pavement below 20mm to 30mm, and the maximum temperature of the surface layer is not to exceed 180 ° C. The temperature is not lower than 110 ℃; the road surface is accurately sprayed with regenerant and hot asphalt before the second layer of hot milling, and the rear milling device 3-1 performs hot milling on the old asphalt road 40mm ～ 60mm. The flue gas recovery processing device 3-5 performs flue gas recovery processing. After milling, a trapezoidal ridge-shaped recycled material pile is formed. At the same time, the second horizontal scraper conveying and heating device 3-3 regenerates the first layer of 20mm-30mm pavement. The material is sent to the recycled material pile, and the comprehensive temperature of the recycled material pile is not less than 140 ° C;

In step S39, the front third inclined scraper feeding device 4-1 of the microwave tunnel heater 4 is used to feed the material to the tunnel horizontal conveying device 4-2, and the microwave heating unit 4-5 is used to emit a 2.45 GHz microwave. Reheat the recycled material, raise the temperature by 10 ℃ ～ 15 ℃, and the comprehensive temperature of the recycled material pile after heating is not lower than 150 ℃;

In step S310, the resurfacing regeneration of the middle layer and the paving regeneration of the upper layer are completed at the same time by the remixing and recycling machine 7. The resurfacing of the middle layer refers to the combination of the dump truck + the multi-functional feeder adding material 5 to transport the new asphalt mixture to The reclaimed material pile that is raised after milling is completed by the second mixer 7-1 and the second mixer 7-1 of the remixing machine. The two materials are evenly mixed and the middle layer of the reclaimed material pile is generally not lower than 150 ° C. Use the microwave heating wall 7-3 to send 2.45GHz microwave to reheat the middle layer recycled material pile. After heating, the average temperature of the mixing pile should not be lower than 160 ° C. The thermal bonding and heating of the asphalt pavement after the planing, the temperature is not lower than 120 ° C. The reclaimed material of the middle course layer is paved and pre-pressed to form a completely new middle course through the first-level cloth spiral 7-4 and the first-level screed 7-5. Layer, paving regeneration of the upper layer refers to the combination of the dump truck + multi-functional feeder adding material 5 to transport the upper layer of recycled material to the transition hopper 7-9, and then transported by the horizontal conveying device 7-8 to slide back to the middle layer After the pre-pressing of the cloth and paving of the secondary cloth spiral 7-6 and the secondary foundation paving screed 7-7, The new top layer of hot ", and finally by rolling compaction, regenerated asphalt pavement.

The invention provides a hot-air microwave composite in-situ thermal regeneration complete unit using layered construction and a construction method thereof, which adopts in-situ hot-air layered heating, layered thermal milling, and layered conveying heating processes for asphalt pavement to realize semi-enclosed. Low temperature construction reduces energy consumption and improves construction efficiency; adopts new modular hot air variable power heating + 2.45GHz frequency microwave composite heating technology to achieve non-destructive and efficient heating of asphalt pavement, restores asphalt road performance, smoke-free environmental protection, heating Moderate depth, low temperature gradient between layers, thermal milling without gradation damage, the temperature of asphalt material in all links reaches the standard, and high construction quality; the addition of new materials adopts the combination of dump truck and multi-functional feeder to achieve multiple degrees of freedom, multiple Oriented feeding, accurate and continuous feeding, and low temperature drop of the asphalt material. The unique remixing and regenerating machine adopts a double screed and double screed design, which can realize a brand-new refilling, remixing and paving regeneration process, taking into account the upper layer, At the same time, the middle layer is added and remixed and recycled, which realizes the real double-layer paving and improves the regeneration quality of asphalt pavement.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the foregoing embodiments. What is described in the above embodiments and the description is only to explain the principle of the present invention. The present invention will also have the following without departing from the spirit and scope of the present invention. Various changes and improvements fall within the scope of the claimed invention. The claimed scope of the invention is defined by the appended claims and their equivalents.

Claims

A layered thermal milling device, which is characterized by comprising: sequentially setting a hot air heater, a front milling heater, and a rear milling heater;

The hot air heater is used for heating old asphalt pavement;

The front milling heating machine includes a front milling heating machine body, a front milling device is provided at a front portion of the front milling heating machine body, and a first An inclined scraper feeding unit and a first horizontal scraper feeding and heating unit; a heating element is arranged below the first horizontal scraper feeding and heating unit;

The rear milling heating machine includes a rear milling heating machine body, and a second inclined scraper lifting unit is provided at the front of the rear milling heating machine body. A second horizontal scraper feeding and heating unit is provided at the rear of the second horizontal scraper feeding and heating unit; a heating device is arranged below the second horizontal scraper feeding and heating unit; a rear milling device is arranged at the rear of the body of the rear milling heating machine.
A hot air microwave composite in-situ thermal regeneration unit is characterized in that it includes:

The layered thermal milling device according to claim 1;

A microwave tunnel heater, which is located behind the rear milling heater in the layered thermal milling equipment and is used to heat the material output from the layered thermal milling equipment, which includes:

Microwave tunnel heating machine body;

A third inclined squeegee lifting device, the third inclined squeegee lifting device is disposed below the foremost part of the body of the microwave heating machine;

A tunnel-type horizontal feeding unit including a closed cavity, a distributor, a microwave heating unit, and a feeding assembly. The closed space is provided with an inlet at the top and an outlet at the bottom; the distributor The microwave heating unit is provided at the entrance of the top of the confined space and above the entrance of the conveying assembly; the microwave heating unit is provided at the top of the confined space and is above the conveying assembly; The exit end is located above the exit at the bottom of the enclosed space.
The hot-air microwave composite in-situ thermal regeneration unit according to claim 2, wherein the tunnel-type horizontal feeding unit further comprises a first suppressor and a second suppressor, and the first suppressor and the second suppressor They are respectively arranged at the entrance and the exit of the enclosed space, and are used to prevent leakage of microwaves.
The hot-air microwave composite in-situ thermal regeneration unit according to claim 3, wherein the front milling heating machine body is provided with a first hot asphalt spraying unit, a first regenerant spraying unit, and a first flue gas recovery unit. Processing device

The first hot asphalt spraying unit and the first regenerant spraying unit are respectively used to spray hot asphalt and regenerant onto the upper layer of the old asphalt pavement; the first flue gas recovery processing device is close to the front milling device, Used to recover the flue gas generated during the milling process by the front milling heater;

The rear milling heating machine body is provided with a second hot asphalt spraying unit, a second regenerant spraying unit and a second flue gas recovery processing device; the second hot asphalt spraying unit and the second regenerant spraying unit are respectively It is used for spraying hot asphalt and regenerant on the middle layer of old asphalt pavement; the second flue gas recovery processing device is close to the rear milling device, and is used for recycling the rear milling heater generated during the milling process. Smoke.
The hot-air microwave composite in-situ thermal regeneration unit according to claim 3 or 4, characterized in that: the hot-air microwave composite in-situ thermal regeneration unit further comprises a feeder; the feeder includes a feeder body, and the feeder The front of the machine body is provided with a first hopper, and a material conveying and extracting device is provided at the exit of the first hopper for conveying and extracting. The end of the material conveying and conveying device far from the first hopper is provided. A slewing bearing assembly is provided, the slewing bearing assembly is hinged with a slewing feed device, and the slewing feed device is connected with the cab through a luffing cylinder;

Under the action of the slewing bearing assembly, the slewing feed device realizes 90 ° left and right rotations about its rotation center with the slewing bearing assembly;

Under the action of the luffing cylinder, the swivel feeding device realizes the luffing adjustment of 0-35 ° up and down relative to its connection point with the slewing bearing assembly.
The hot-air microwave composite in-situ thermal regeneration unit according to claim 5, wherein the hot-air microwave composite in-situ thermal regeneration unit further comprises a remixer, and a second hopper is provided at the front of the remixer, The bottom of the second hopper is provided with a scraper conveying and metering device, and the end of the scraper conveying and metering device is provided with a fourth inclined scraper lifting device, and the lower part of the fourth inclined scraper lifting device is two A first thermal connection heating wall is provided between the bridges, and a first agitator is arranged above the end of the body of the compounder.
The hot-air microwave composite in-situ thermal regeneration unit according to claim 5, characterized in that: the hot-air microwave composite in-situ thermal regeneration unit further comprises a remixing regenerator; the remixing regenerator is located directly behind the feeder. Or the oblique rear of the adjacent left and right lanes, which includes a remixing machine body, a second agitator is provided at the front of the remixing machine body, and second and opposite sides of the second agitator are provided with opposite second The heating wall is thermally connected. Several groups of microwave heating walls are provided behind the second mixer. The rear end of the remixing machine body is provided with a first cloth spiral and a first screed in order, behind the first screed. A second cloth spiral and a second screed are sequentially provided, and a horizontal feeding device is provided between the left and right support beams of the re-mixing machine body. The horizontal feeding device extends forward and is connected with a transition hopper and extends backward. A feed trough is connected, and a material-feeding bottom plate of the horizontal material-feeding device between the transition hopper and the second agitator is provided with an automatic opening discharge door.
The hot-air microwave composite in-situ thermal regeneration unit based on claim 7, further comprising:

In step S11, the hot asphalt heater is used to heat the old asphalt pavement. The heating depth of the old asphalt pavement is a set first depth range value. The maximum temperature of the old asphalt pavement surface is less than or equal to the set first temperature threshold. The temperature at the first depth range value is greater than or equal to a set second temperature threshold;

Step S12: spray the regeneration agent and hot asphalt on the heated old asphalt pavement by using a front milling heater, and then perform hot milling on the old asphalt pavement within a first depth range by using a front milling device to form a regeneration Material, the temperature of the recycled material pile is greater than or equal to the third set temperature threshold, and the material is fed to the first horizontal scraper feeding and heating unit through the first inclined scraper feeding unit, and then conveyed and heated to maintain the temperature. One layer of pavement heating and milling operation; then the heating element under the front milling heating machine body is used to continue heating the old asphalt pavement below the first depth range;

In step S13, the second inclined scraper feeding device in the rear milling heating machine is used to feed the material to the second horizontal scraper conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is continuously conveyed backward and heated for heat preservation. ; The heating element under the body of the rear milling heating machine is used to continue heating the old asphalt pavement below the first depth range, and the maximum surface temperature is controlled to be less than or equal to the set first temperature threshold, and the temperature at the second depth range in the pavement. Greater than or equal to the set second temperature threshold; spraying regenerant and hot asphalt on the second layer of pavement in the second depth range, and using a rear milling device to thermally mill the old asphalt pavement in the second depth range To form a recycled material pile, and at the same time, the second horizontal scraper conveying and heating unit transports the recycled material formed by the first layer of road surface to the recycled material pile to form a recycled material pile mixture, and the comprehensive temperature of the recycled material pile mixture Greater than or equal to setting a third temperature threshold;

In step S14, the third inclined scraper feeding device in the microwave tunnel heating machine is used to feed the material to the tunnel-type horizontal conveying device for backward transportation, and the microwave heating unit is used to emit microwaves to perform secondary heating on the recycled material pile mixture. The comprehensive temperature of the heated recycled material pile mixture is greater than or equal to the fourth temperature threshold;

Step S15: Use a feeder to add a new asphalt mixture to the reclaimed material pile mixture of the microwave tunnel heater, or add a new asphalt mixture to the transition hopper of the remixing regenerator, and pass the Open and close control the new asphalt mixture to enter the second mixer; use the remixing regenerator to complete the mixing of the recycled material pile mixture and the new asphalt mixture to form a mixed material pile. When the temperature of the mixed material pile is lower than When the fifth temperature threshold is set, the second microwave heating wall is used to emit microwaves to supplement the temperature of the mixing pile. After heating, the average temperature of the mixing pile is less than or greater than the fifth temperature threshold, and the second mixer is used. The left and right sides are provided with second thermal connection heating walls to heat the thermal bonding of the milled asphalt pavement. The heating temperature is greater than or equal to the sixth temperature threshold. The flat screed is lifted, and the secondary cloth spiral and the secondary foundation paving screed are used to complete the cloth and pre-press, and finally compacted to obtain a recycled asphalt pavement;

Or use a dump truck to directly add new asphalt mixture to the second hopper of the remixer, and complete the metering and transportation of the new asphalt mixture to the recycled material pile through the scraper conveying and metering device. The fourth inclined scraper lifting unit will Recycled material and new asphalt mixture are continuously conveyed to the first overhead mixer, which is fully mixed to form a material pile. The first thermally connected heating wall heats the thermally bonded asphalt pavement after milling, and the temperature is not lower than the sixth temperature threshold. , Using an independent paver to complete the cloth, paving, and finally compaction compaction to get recycled asphalt pavement.
The hot-air microwave composite in-situ thermal regeneration unit based on claim 7 is characterized by comprising:

In step S21, the hot asphalt heater is used to heat the old asphalt pavement. The heating depth of the old asphalt pavement is a set first depth range value. The maximum temperature of the old asphalt pavement surface is less than or equal to the set first temperature threshold. The temperature at the first depth range value is greater than or equal to a set second temperature threshold;

Step S22: spray the regeneration agent and hot asphalt on the heated old asphalt pavement by using a front milling heater, and then perform hot milling on the old asphalt pavement within a first depth range by using a front milling device to form regeneration Material, the temperature of the recycled material pile is greater than or equal to the third set temperature threshold, and the material is fed to the first horizontal scraper feeding and heating unit through the first inclined scraper feeding unit, and then conveyed and heated to maintain the temperature. One layer of pavement heating and milling operation; then the heating element under the front milling heating machine body is used to continue heating the old asphalt pavement below the first depth range;

In step S23, the second inclined scraper lifting device in the rear milling heating machine is used to pick up the material to the second horizontal scraper conveying and heating unit, and continue to transport the recycled material pile formed by the first layer of pavement backward and heat it. ; The heating element under the body of the rear milling heating machine is used to continue heating the old asphalt pavement below the first depth range, and the maximum surface temperature is controlled to be less than or equal to the set first temperature threshold, and the temperature at the second depth range in the pavement. Greater than or equal to the set second temperature threshold; spraying regenerant and hot asphalt on the second layer of pavement in the second depth range, and using a rear milling device to thermally mill the old asphalt pavement in the second depth range To form a recycled material pile, and at the same time, the second horizontal scraper conveying and heating unit transports the recycled material formed by the first layer of road surface to the recycled material pile to form a recycled material pile mixture, and the comprehensive temperature of the recycled material pile mixture Greater than or equal to setting a third temperature threshold;

In step S24, the third inclined scraper lifting device in the microwave tunnel heater is used to feed the material to the tunnel-type horizontal conveying device for backward transportation, and the microwave heating unit is used to emit microwaves to perform secondary heating on the recycled material pile mixture. The comprehensive temperature of the heated recycled material pile mixture is greater than or equal to the fourth temperature threshold;

Step S25, using the feeder to drive the regeneration lane and the left and right side lanes to complete the addition of the new asphalt mixture in the regeneration pile and the transition hopper in the remixing regeneration machine, one of which is continuously raised after milling. The new asphalt mixture is directly added to the recycled material pile, and the new asphalt mixture is continuously added to the transition hopper in the remixing regeneration machine, and then the new asphalt mixture is transported backward by the feeding device in the feeder;

In step S26, the re-mixing regeneration machine is used to complete the re-mixing regeneration and surface surfacing at the same time. The re-mixing regeneration means that the feeder conveys the new asphalt mixture to the reclaimed material pile after milling, The mixer completes the mixing of the two uniformly and forms a mixing stockpile. When the temperature of the mixing stockpile is lower than the set fourth temperature threshold, a microwave heating wall is used to emit microwaves to re-mix the mixing stockpile after the remixing. Temperature supplement heating, the second thermal connection heating wall on both sides heat-bonds the milled asphalt pavement, and the mixing pile is pre-compressed by a first-level cloth spiral and a first-level screed to form a re-mixed regeneration layer. The surface paving is when the feeder conveys the new asphalt mixture to the transition hopper, and the new asphalt mixture is controlled by the horizontal conveying device to slide back to the re-mixed regeneration layer, and is spread by the secondary cloth spiral and the secondary foundation. The screed cloth and pavement are pre-pressed to form a new “hot-to-hot” new thin abrasion layer of asphalt, which is finally compacted by rolling to obtain a recycled asphalt pavement.
A method for simultaneously adding, remixing, and regenerating upper and middle layers of a hot-air microwave composite in-situ thermal regeneration unit according to claim 7, comprising: a step of replenishing, remixing, and transferring the upper layer and the middle layer Additive remixing and paving regeneration steps of the upper layer;

The step of adding, remixing and transferring the upper layer includes:

In step S31, the hot asphalt heater is used to heat the old asphalt pavement; the heating depth of the old asphalt pavement is a set first depth range value, and the maximum temperature of the surface of the old asphalt pavement is less than or equal to the set first temperature threshold. The temperature at the first depth range value is greater than or equal to a set second temperature threshold;

Step S32: spray the regeneration agent and hot asphalt on the heated old asphalt pavement by using a front milling heater, and then perform hot milling on the old asphalt pavement within a first depth range by using a front milling device to form regeneration Material, the temperature of the recycled material pile is greater than or equal to the third set temperature threshold, and the material is fed to the first horizontal scraper feeding and heating unit through the first inclined scraper feeding unit, and then conveyed and heated to maintain the temperature. One layer of pavement heating and milling operation; then the heating element under the front milling heating machine body is used to continue heating the old asphalt pavement below the first depth range;

In step S33, the second inclined scraper feeding device in the rear milling heating machine is used to feed the material to the second horizontal scraper conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is continued to be transported backward and heated for heat preservation. ; The heating element under the body of the rear milling heating machine is used to continue heating the old asphalt pavement below the first depth range, and the maximum surface temperature is controlled to be less than or equal to the set first temperature threshold, and the temperature at the second depth range in the pavement. Greater than or equal to the set second temperature threshold; spraying regenerant and hot asphalt on the second layer of pavement in the second depth range, and using a rear milling device to thermally mill the old asphalt pavement in the second depth range To form a recycled material pile, and at the same time, the second horizontal scraper conveying and heating unit transports the recycled material formed by the first layer of road surface to the recycled material pile to form a recycled material pile mixture, and the comprehensive temperature of the recycled material pile mixture Greater than or equal to setting a third temperature threshold;

In step S34, the third inclined scraper feeding device in the microwave tunnel heating machine is used to feed the material to the tunnel-type horizontal conveying device for backward transportation, and the microwave heating unit is used to emit microwaves to perform secondary heating on the recycled material pile mixture. The comprehensive temperature of the heated recycled material pile mixture is greater than or equal to the fourth temperature threshold;

Step S35, the new asphalt mixture is directly added to the second hopper of the remixer by a dump truck, and the new asphalt mixture is metered and conveyed to the reclaimed material pile through the scraper conveying and metering device, and the fourth inclined scraper is used to lift the material. The device continuously transfers the recycled material and new asphalt mixture to the first overhead mixer. The recycled material directly falls into the hopper of the multifunctional feeder. The upper layer of recycled material is completed through the functions of the feeder's rotation, amplitude, and transportation. Transfer to a dump truck; the steps of adding, remixing and regenerating the middle layer and paving and regenerating the upper layer include:

In step S36, the hot asphalt heater is used to heat the old asphalt pavement. The heating depth of the old asphalt pavement is a set first depth range value. The maximum temperature of the old asphalt pavement surface is less than or equal to the set first temperature threshold. The temperature at the first depth range value is greater than or equal to a set second temperature threshold;

Step S37: spray the regeneration agent and hot asphalt on the heated old asphalt pavement by using a front milling heater, and then perform hot milling on the old asphalt pavement within a first depth range by using a front milling device to form regeneration Material, the temperature of the recycled material pile is greater than or equal to the third set temperature threshold, and the material is fed to the first horizontal scraper feeding and heating unit through the first inclined scraper feeding unit, and then conveyed and heated to maintain the temperature. One layer of pavement heating and milling operation; then the heating element under the front milling heating machine body is used to continue heating the old asphalt pavement below the first depth range;

In step S38, the second inclined scraper lifting device in the rear milling heating machine is used to feed the material to the second horizontal scraper conveying and heating unit, and the reclaimed material pile formed by the first layer of pavement is continuously transported backward and heated for heat preservation. ; The heating element under the body of the rear milling heating machine is used to continue heating the old asphalt pavement below the first depth range, and the maximum surface temperature is controlled to be less than or equal to the set first temperature threshold, and the temperature at the second depth range in the pavement. Greater than or equal to the set second temperature threshold; spraying regenerant and hot asphalt on the second layer of pavement in the second depth range, and using a rear milling device to thermally mill the old asphalt pavement in the second depth range To form a recycled material pile, and at the same time, the second horizontal scraper conveying and heating unit transports the recycled material formed by the first layer of road surface to the recycled material pile to form a recycled material pile mixture, and the comprehensive temperature of the recycled material pile mixture Greater than or equal to setting a third temperature threshold;

In step S39, the third inclined scraper feeding device in the microwave tunnel heating machine is used to feed the material to the tunnel-type horizontal conveying device for backward transportation, and the microwave heating unit is used to send microwaves to perform secondary heating on the recycled material pile mixture. The comprehensive temperature of the heated recycled material pile mixture is greater than or equal to the fourth temperature threshold;

Step S310, using a remixing and recycling machine to complete the resurfacing of the middle layer and paving regeneration of the upper layer at the same time. The resurfacing of the middle layer refers to the feeding machine conveying the new asphalt mixture to the recycled pile after milling. The second agitator of the remixing regeneration machine completes the mixing of the two uniformly and forms a middle-surface layer recycled material pile. When the temperature of the middle-surface layer recycled material pile is less than a set fourth threshold, a microwave heating wall is used to emit The microwave reheats and reheats the middle layer recycled material pile. The second thermal connection heating wall on both sides heats the asphalt pavement after milling, and the middle layer recycled material passes the first-level cloth spiral and the first-level ironing. The flat paving is pre-pressed to form a new mid-level layer. The upper-layer paving regeneration refers to the feeding machine conveying the upper-layer recycled material to the transition hopper, and then transported by the horizontal conveying device to the rear surface and slide down to the mid-level layer. The first-level cloth spiral and the second-level foundation paving screed are pre-compressed to form a new top layer of "heat-to-heat", which is finally compacted by rolling to obtain a recycled asphalt pavement.